Here is a Dateline series you can watch:
http://www.nbcnews.com/video/dateline/52063577
There was also a very good series, "The Staircase," but you might have to get that on Netflix or something similar.
I think the owl theory is ridiculous, but that's just me.
They didn't use his bisexuality to blacken his character; it was part of the theory of the crime. Kathleen had discovered his shenanigans with male prostitutes that night (there was evidence she received a fax and went into the office and turned on the computer, if I remember correctly). Supposedly this initiated an argument, which was motive, according to the prosecution.
Peterson blew it in the 911 call when he claimed
Kathleen was still breathing. When emergency personnel arrived minutes later,
the blood was congealed and some had even dried. That was just the beginning of getting to the truth.