Pauley Perrette, who plays "NCIS"' quirky but extremely talented forensic scientist Abby Sciuto, is asking America to help her solve a crime.

It is the 2007 murder of her friend Lisa Williamson, a 40-something woman who lived in downtown Detroit in a neighborhood that had been taken over by drug dealers. To help her get the word out, Pauley is turning to "America's Most Wanted" and John Walsh for assistance.

In the early morning hours of Oct. 29, 2007, someone threw a firebomb into Lisa's house. Luckily, Lisa escaped unharmed and moved in with her parents next door. The next morning, another Molotov cocktail was thrown into her parents' house, and Lisa was trapped upstairs. She died of smoke inhalation. The person who tossed the incendiary devices into the houses has never been caught and Pauley is hoping to remedy that.

This isn't the first time that Pauley has worked with "America's Most Wanted." In 2007, she donated $20,000 of her own money in hopes of tracking down two killers.

"America's Most Wanted" airs Saturdays at 9 p.m. on FOX.