Thanks to new show MONSTER Dahmer: The Jeffrey Dahmer Story, all eyes are once again on the hideous crimes committed by the serial killer.
Now, many true crime fans are asking questions about what made Jeffrey the way he was.
Dahmer’s younger brother David appears in the first episode, and viewers are keen to know what happened to him.
Where is Jeffrey Dahmer's younger brother David?
Many fans were shocked to find that Dahmer had a relatively uneventful childhood, unlike most serial killers who seem to have experience trauma or abuse when young.
The new Netflix series has faced accusations of "humanising" Dahmer and taking the focus away from his many victims, however fans are welcoming the insight into his life.
Viewers are introduced to Dahmer's father Lionel, mother Joyce, and younger brother David, who was six years younger than Jeffrey.
It turns out that Jeffrey actually got to choose David's name when he was born.
The relationship between his parents was rocky, and when Lionel and Joyce divorced she won full custody and took a then-12 year old David with her, and Jeffrey was living alone at the age of 18 (which was when he committed his first murder).
Reports claim that Jeffrey "resented" the attention his younger brother received.
David successfully graduated from the University of Cincinnati in Ohio, before Jeffrey was arrested for his crimes in 1991.
David then "cut all ties" with Jeffrey and refused to attend his trial or hearings.
To mark a decade after Jeffrey’s death, in 2004 Lionel and his new wife Shari appeared on Larry King Live.
They were asked about David, who has since shunned the public eye.
Lionel and Shari gave a small update, saying that he “did change his name" as he wanted to be kept "completely secret.
They went on to add that David now had a "career" and a "family” and that a second grandchild was on the way.
If he still alive, he is 55-years-old, but has remained highly private and understandably so.
With the renewed attention thanks to the Netflix show, he is probably hoping that it stays that way.