I'm sure by now many of us have read about this case, seen the Documentary or both.
I believe he did it. The documentary was biased to the Defense side of things. To the point that the editor of the series was allegedly dating Peterson.
I'd also believe the Owl Theory before I'd believe his wife got those wounds from a fall down a few steps.
https://en.wikipedia.org/wiki/Michael_Peterson_(murder_suspect)#Kathleen.27s_death