Author: Shane Lambert
Original time of writing: February 2017; originally appeared on my Blogger
Updated and revised: February 17, 2026, and again September 15th, 2026
All articles are subject to editing after original posting.
Missing Person: Denise Kathleen Anderson
NamUs Case: MP27540 (Active as of 2026)
Date of Last Contact: Tuesday, April 13th, 1971 (at approximately 5:30 a.m.)
Last Known Location: Apartment at 925 16th Street, Sacramento, California (about 38.57881034100586, -121.48476808126783 on Google Maps, but the app only goes back to 2007)
Age at Disappearance: 22 (DOB is probably July 13th, 1948)
Sex: Female
Race/Ethnicity: White / Caucasian
Height: 5’2″ – 5’4″
Weight: 120 – 125 lbs
Hair: Brown, straight, longer than shoulder length
Eyes: Brown
Clothing/Accessories Note:
- According to reporting and NamUs, Denise was known to wear a black short-hair wig; this item was reportedly missing from the apartment.
Denise Kathleen Anderson went missing in 1971. Her disappearance, to my knowledge, remains without many clues. When I look around on the Internet for writing related to this case, there’s not a lot that doesn’t simply rehash the broadly known case details.
She was 22 years old when she disappeared from Sacramento, California, and the circumstances surrounding her disappearance offer little in the way of a clear explanation for what happened to her.
At the time of her disappearance, Anderson, already an established stage actress, was active in local theatre and was preparing for a production that was scheduled to open just two days after she disappeared. She also worked at a Wells Fargo branch and lived in an apartment with two female roommates. Her car and personal belongings were reportedly left behind, and there has been no known financial activity associated with her following her disappearance.
I originally wrote about Anderson in 2017 and have revisited the case as part of a broader effort to review and update my earlier work. This article takes a close look at Denise’s family. The importance is that if anyone is trying to find more information about her history, then knowing her family members can help with that.
Attempts to Identify Denise Kathleen Anderson’s Parents
When trying to identify someone in the historical record, the possibility of a same-name match is always present. People can share the same first, middle, and last names, making it risky to identify someone based on a name alone. Birthdates provide a much stronger point of comparison, while information about relatives can provide an even more reliable way to distinguish one person from another. With that in mind, here is my examination of who I believe Denise Kathleen Anderson’s parents were.
Denise’s Mother: Helen Vassilopoulos
I am extremely confident that Denise’s mother was Helen Vassilopoulos (14 December, 1924 – 17 November, 2016). This is supported by Websleuths, a website that has some serious web researchers, and by the obituary of Helen Vassilopoulos as well. Her obituary from 2016 mentions that she, Helen, had a daughter named Denise Anderson, and I don’t think it’s just a same-name match. The obituary is below and should be read.
The obituary’s language is interesting in regard to Denise Anderson. It does not use typical obituary language regarding describing a daughter of the deceased. Typically, the language in an obituary would be something like this: “Helen was predeceased by her daughter, Denise Anderson” or “Helen was survived by her daughter, Denise Anderson.” These kinds of statements in obituaries are not uncommon at all.
The language in obituaries often changes when the deceased person’s children are missing people. It changes because the fate of the missing person is not known. That makes it hard to state whether the missing person should be described as “predeceased” or “survived by.” In addressing this, “presumed deceased” is one phrase that is used. In Helen’s obituary, the chosen phrase was “Helen had a daughter, Denise Anderson.” That phrase, as used, is one way to describe Helen’s daughter without committing to Denise being alive or dead. Since no one knows with full certainty whether Denise is alive or dead, the statement is appropriate and supports the opinion that Helen was the missing person’s mother (ie., it’s not just a same-name match or matches).
Denise’s age in 1971, when she disappeared, is known. She was 22 years old according to her NamUs profile. That matches an Ancestry record for a Denise Kathleen Anderson. Furthermore, that same record states that her mother’s maiden name was Vassilopoulos. I think that her mother was Helen Vassilopoulos, which is very convincing based on the obituary and the information at Ancestry.
Who Was Denise’s Father?
Finding her father was more complicated. As of February 19th, 2026, I would state with some confidence that it was a man named Frederick Edward Anderson. A man with that name died June 30th, 1969, at the age of 77 years, meaning he would have been born between July 1, 1891, and June 30, 1892. Establishing that this individual was Denise’s father was a bit tricky, but I am confident that the obituary below is of the missing person’s father.
Firstly, the obituary for this individual listed two children. Yet, it contains a nagging missing detail. Look at the obituary below: a surviving child, as of Frederick’s death, is described as Denise K. Anderson. Whether that “K” stands for Kathleen is one matter. Another matter is whether it would actually be the same Denise Kathleen Anderson (because I did find a second one in California).
As you can see, the deceased Frederick Edward Anderson had a son with a pretty similar name, “Fred E. Anderson Jr.” So in addition to verifying if the Denise K. Anderson described in the obit is the same one as the missing person, my searches were compounded by a father-son exact name match (they ended up both being named Frederick Edward Anderson, with the younger adding Jr.).
But I found a census from 1950 that was a good piece of evidence. The following census shows a 1-year-old in 1950 named Denise K. Anderson, and that age matches the missing person Denise Kathleen Anderson, because she was born in July 1948 and would be 1 year old for about the first half of 1950. Furthermore, according to the census below, Denise (described as “daughter”) is living with Helen Anderson, which would be the married name of Helen Vassilopoulos (Denise’s mother), who is described as Helen Vassilopoulos Anderson in her obituary. The census below also shows the head of the household as Frederick E. Anderson, which is strong evidence that this man was her father (but not conclusive).
The problem is the age of the father does not match when compared to the obituary. It lists him as 36 years old, whereas the obituary above would mean that Frederick Edward Anderson should be in his 50’s as of 1950. This detail was a major source of confusion in my research and suggested that the two pieces of evidence pertained to different people.
The obituary says this:
- Frederick Edward Anderson would be born in 1891 or 1892 by his age and death date
The 1950 census says this:
- Frederick E. Anderson would be born abour 1914 to be an age of 36 in 1950
Both the census and the obituary support a father-daughter relationship between a Frederick E. Anderson and a Denise K. Anderson. However, the ages of the father mismatch, which would suggest that the father’s are different people. It’s these kinds of problems that you bump into when trying to authenticate identities in historical documents. The age gap is actually pretty big.
So are we looking at two different families concerning the obituary and the census? One thing caught my eye: the number “36” for his age appears to have been written over something. The following is a close-up of the age for Frederick Edward Anderson as represented in the 1950 Census.
That is one messy 3 in 36. I could make it out to be a 2 using the bottom or a sloppy 5 without much of a spine in the 5. But all I think that can responsibly be said is that the number that was written could be disputed. So what do we have?
- There’s a Frederick Edward Anderson who was born about 1892 (obituary);
- There’s a Frederick Edward Anderson Jr. born about 1924 (this sounds like the son referred to in the obituary);
- If that’s a 36 in the 1950 census, there is a Frederick Edward Anderson born about 1914.
I came to the conclusion that the age was wrong wrong in the 1950 census. I looked at the 1940 Census and it shows a man named Frederick E. Anderson as the head of a household with his wife Ruth L. Anderson and son Fred E. Anderson.
Frederick E. Anderson is listed at age 45 in the 1940 census, meaning he would have been born around 1895. That drastically changes Frederick E. Anderson’s age between the 1940 and 1950 censuses (ie. someone who is 45 in 1940 would be 55 in 1950, not 36). It all suggests sloppy census work or mispresented ages.
Yet, the obituary didn’t match anything. It had an age of 77 in 1969 for the Frederick E. Anderson there. A birthdate of 1891 or 1892 would make for a different person, regardless of a same-name match, than for a person with a birthdate of 1895. The matter cannot simply be overlooked without risking the conflation of different identities. It was hard to tell if we were looking at different people with the same name or one person with a birth year that wasn’t known for sure or wasn’t represented carefully, for whatever reason.
But I still think the Frederick E. Anderson in the 1940 census is the same Frederick E. Anderson living with Denise and her mother Helen in the 1950 census. I make an inferential leap on this matter but ground some confidence in more than just a same-name match. Both the 1950 census and the 1940 census show Frederick E. Anderson as originally hailing from Illinois, employed as an engineer, and employed with the US government in that capacity.
A same-name match with first, middle, and last name, the same state of birth, the same profession (ie., engineering), and the same employer is a lot to overlook simply because of an age discrepancy when the writing is sloppy. Furthermore, looking back at the 1930 census shows a Frederick E. Anderson living with a woman named Ruth and a son named Fred. This Frederick E. Anderson was an engineer as well, but with the state of California as an employer. If he is in the 1930 census as an engineeer, then there’s no way he was born in 1914, as the 1950 Census would suggest.
The 1930 and 1940 census link the Andersons by house number 861 as well. Importantly, the 1940 census states that Frederick E. Anderson is 45, whereas the 1930 census states he is 38. This proves that the census did not accurately depict ages by year of publication. The expectation is 10 years of aging for a ten-year gap between censuses. Perhaps 9 or 11 could be expected, depending on the time of year when the work is completed. However, seven years of aging for a ten-year gap between censuses is hard to accept. It’s fair to say that ages in the censuses from this time frame need to be taken lightly.
My conclusion on this section is a fairly confident “yes” that the Denise K. Anderson mentioned in the obituary for Frederick E. Anderson is the same person as the missing person, Denise Kathleen Anderson. It’s not just a same-name match: there’s evidence to show that Denise Kathleen Anderson lived with a man of that name when she was very young, along with her mother. The evidence also shows this man’s age was inconsistently reported and without clear writing. The matter can be looked at from other angles, but it seems her father was Frederick Edward Anderson (b. in the 1890’s and died in 1969). In this case, the newspaper obituary seems to be a stronger piece of evidence than the census.
Other family
Her mother was fairly simple to identify, while her father took some work. But if I have her parents correct, her half-brother would be Frederick Edward Anderson Jr., who was five years old in the 1930 census and 15 years old in the 1940 census. I think he might be the same person who owned or part-owned several sports franchises.
Circumstances of Denise’s Disappearance:
- Denis was last seen (or heard?) asleep in her apartment at approximately 5:30 a.m. on Tuesday, April 13, 1971, by one of her two female roommates.
- A roommate borrowed Denise’s car that morning and returned it around 2:30 p.m.; Denise was gone at that time.
- Her vehicle remained at the residence after that day.
- Her personal belongings were reportedly left behind.
- No known financial activity occurred after her disappearance.
- She did not report to her job at a Wells Fargo branch and did not attend subsequent theatre rehearsals.
Denise’s case is one of the true vanishings in North American history. Based on what’s available and published about her, there are no clues as to her fate after she was last seen. Everything is pure conjecture, running through common missing-person scenarios.
Employment and Activities:
- She went to Sacramento High School. Her name and possibly her picture appear on Page 160 of the 1965 yearbook on Ancestry.
- She was employed at a Wells Fargo bank branch in Sacramento. I found one that was located at 555 Capitol Mall in 1971, which would have been a 20-minute walk. However, if this was her branch or not is not known.
- She had been very active in the stage-acting scene for four years by the time of her disappearance (not including high school plays).
- From age 18 through age 22, Denise Anderson was:
- Consistently active in theatre for at least four consecutive years
- Involved in productions at:
- Harlequin Stage (community theatre)
- Sacramento State College
- Sacramento City College
- American River College (collaborative production)
- She was frequently named in cast lists and pictured in multiple productions
- She was firmly embedded in Sacramento’s collegiate arts community
- Months before her disappearance time, she was active in local theatre; listed as a cast member in a January 3, 1971 Sacramento Bee production notice for the play “Liliom” at the Eaglet Theater. She also had a supporting role in a play that was about to debut in two days at the time of her April 13th, 1971 disappearance.
The Play Denise Was in at the Time of Her Disappearance
Denise was in a play known as “Marat/Sade” at the time of her disappearance. The long name was “The Persecution and Assassination of Jean-Paul Marat as Performed by the Inmates of the Asylum of Charenton under the Direction of the Marquis de Sade” by Peter Weiss. The opening night for the play was April 15th, 1971, meaning Denise disappeared two days before the opening of the play. She was cast as Simone Evrard (misspelled as Simone Everad). I did not find Denise among listed cast members, however, her name appeared in a caption underneath a photo on April 18th, 1971. This photo was published five days after she was last seen, meaning that it must have been taken before her disappearance and during rehearsals.
I made an effort to find out who replaced Denise, because the show did go on despite her disappearance two days before it debuted. The play received good reviews and ran into May, as planned. Her character was not a plot-driving one, meaning it would be a bit easier to replace than a main character. I did wonder if the wig that was missing from her apartment was depicted in the picture above, but could not authenticate this. Also, I found no reference to her disappearance at all in the numerous articles or advertisements I read regarding this play. It struck me that her disappearance was not considered too serious at the time or not considered clandestine at the time. But the photo above would be one of her last, most likely.
Centerplayers Production — The Persecution and Assassination of Jean-Paul Marat as Performed by the Inmates of the Asylum of Charenton under the Direction of the Marquis de Sade (April 15th, 1971–May 1971)
Bob Brock — Jean-Paul Marat
Haze Bergeron — Marquis de Sade
Tom McGraw — Duperret
Michael Hefner — Jacques Roux
James L. (Jim) Foster — Institution Director (Coulmier)
Pat Dunnigan Shread — Herald
Zoe Riddle — Charlotte Corday
Victoria (Tori) Samuels — Marat’s nurse
Cheryl Watson — Singer
Tom Ribordy — Singer
John Karr — Singer
Nancy Vay David — Singer
*Denise Anderson — Simonne Evrard (spelled Simone Everad)
Director: John Gunn
*disappeared two days before opening night for the play/replacement not known
I don’t think the serial killers associated with Sacramento can be suggested as related to Denise’s disappearance without evidence. Denise’s case, to my knowledge, is without a serious clue. If you are working on this case, I think the reasonable thing to do is to look at probate or a will regarding the 1969 of the man who, I think, is her father. Furthermore, the whereabouts of her vehicle the day she was last seen would be useful details to add.
Further reading: this blog post looked to be a serious effort on the topic of Denise Kathleen Anderson. It contains address information and perhaps even a bit of a challenge to what her address was at the time of her disappearance.
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