mr. big, denis took two other undercover officers to the scene of the crime. of course, he believed he was talking to fellow gang members. >> after you shot her, what happened then? >> i -- i brought her more behind the garage. >> so you just shot the once, right? >> once. i don't believe in twice. >> then denis' criminal friends asks him to take them to where he dumped wendy's body. they said they needed to make sure there was no evidence left. it took awhile to find the place. he hadn't been back in 11 years. but finally he was sure. >> so if i walk there the wires are there, you know? so everything makes sense. >> and as they continued searching the area -- >> oh my gosh. i'm putting on my gloves. >> what is it? >> if that's black, that's the tarp. that's a piece of the tarp. >> a couple of days later, anna got a call. it was the police, asking her to come downtown. >> and -- they sat me down.