If I was the grandfather I get three or four of my biggest, toughest friends, kidnap the moron and taken him to an undisclosed location where I can assure you he would confess willingly. Following the confession, he’d never be seen again. Forget the police. The guy in Chicago was cop, killed three of his four wives and is still walking around free.
If you are referring to Drew Peterson - he was arrested and is being held in jail for the drowning murder of his 3rd wife, Kathleen Savio and only a suspect in the disappearance of Stacey, his 4th wife.
http://www.nowpublic.com/world/drew-peterson-latest-news-two-counts-murder-kathleen-savio
IIRC - his first two wives are still alive.
However, your anger and frustration are normal human responses to these barbarians.
I have to say that I would do the same thing. Waiting on law enforcement to eventually get to the truth would probably not work well for me in such a situation.