According to Dahmer's father, there were at least a couple opportunities to stop his son's murder spree.

Lionel Dahmer's interview with the TV host is included in a 3 day Dahmer special.

Lionel told about the time when Jeffrey was living with his grandmother in Milwaukee and how he kept a wooden box that Lionel suspected was pornography.

Jeffrey was able to purchase himself a day and then sneak out a severed human head, which he replaced with porno magazines and the like. Jeff told Lionel that the jig would be up if he pressed the issue the day he wanted it open.

Lionel talked about how when he was young and going through puberty, he would get a sexual thrill by playing with animals' guts. The signs were there in retrospect.

Phil's guests and the families of the victims are not happy with how it was portrayed.