It's surprising how many killers return not just to the gravesite but to the scene of the crime. They do it for different reasons. They may want to find out where the investigation is headed or look for cues that it's progressing along nicely because, naturally, they're concerned about that. They may go to the police in order to beat them to the punch, just in case someone may have seen them or provided a description of their car. I was cooperative.
Assassins are notorious for keeping news clips.
Assassin-type personalities will also keep diaries. George Wallace, kept diaries describing the fantasies they wanted to act out. It's like in the Wild West, where they used to cut notches in a gun. The whole thing seems like it's relived. It's fantasy, but it never ends.