The implication, then, is upon further investigation, they will find out many sordid details about this scumbag killer.
I do hope the digging into the details will go public. I would guess that the man has practice killed animals leading up to this and had suicidal ideations that were probably documented privately, if not publicly. But, that's just a guess.
It takes a lot for a person to want to sacrifice their life in cause of something. There's usually a lead up to it. I'm not trying to imply that the guy has a closet full of bodies ala Bundy...just that he's not some clean Mr. Rogers who woke up one day and "snapped".