Legal commentator Nancy Grace followed Laci Peterson’s disappearance and her husband, Scott Peterson’s, murder trial very closely. In fact, Scott Peterson’s father accused her of poisoning America’s consciousness about the case.

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On Monday’s episode of Dr. Phil, Grace faces off with Peterson’s sister-in-law, Janey Peterson, who claims the family has evidence to show that Scott is innocent.

“Overwhelming evidence shows Scott Peterson is guilty,” Grace says. “The most important evidence in this case is that he places himself at the crime scene.”

WATCH: What A News Reporter Says About Her First Meeting With Scott Peterson

In the video above, hear phone calls between Peterson and the woman he was having an affair with, Amber Frey. What did he tell her just days after Laci disappeared? And, Grace and Janey share their thoughts.

On Monday, hear what Janey claims is evidence that shows Peterson is innocent and doesn’t belong on death row. Check here to see where you can watch.

Footage provided by Investigation Discovery. You can watch An American Murder Mystery: Scott Peterson on ID GO, the Investigation Discovery app.

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