Dahmer was 34 years old when he was killed. He died just two years after beginning his time at the Columbia Correctional Institute in Wisconsin. If he was alive today, Dahmer would be 63 years old and still serving his 16 life sentences.

Several sources claim that psychiatrists and legal experts estimated Dahmer's IQ to be around 145, which places him in the range of borderline genius. However, in the book "The Quest for the Nazi Personality" Dahmer's IQ is said to have been 121 (superior range).

His fascination with dead animals may have begun when, at the age of four, he saw his father removing animal bones from beneath the family home. According to Lionel, Dahmer was "oddly thrilled" by the sound the bones made, and became preoccupied with animal bones, which he initially called his "fiddlesticks".

Konerak Sinthasomphone was just 14 years old when he managed to escape from Dahmer's lair in 1991 — but unwitting police officers handed him right back over to Dahmer, sending him to his brutal death. YouTubeKonerak Sinthasomphone, the youngest victim of serial killer Jeffrey Dahmer.