03/24/2010 05:12 am ET Updated May 25, 2011

Peterson Trial: Cop Admits Mistakes Were Made In Ruling Savio's Death Accidental

A retired Illinois state police sergeant admitted there were numerous shortcomings in his investigation that concluded the death of Drew Peterson's third wife was an accident.

"I'm not going to beat myself up right now, you can second-guess anything," Patrick Collins testified today. "Looking back now, everything could have been important. But at that particular moment, I was looking for things that were more obvious."

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