so very carefully, they set up a sting. its target, one of the prime suspects, the youngest one, the one they believe might be most vulnerable. they hope this ex-girlfriend will help them extract a conviction. it's late on a friday night. the suspect, larry nicassio has been lured to a ventura motel. she's cooperating. she's in on the sting. the cops are in the next room. it's been years since they saw each other, but all during that time, she has suspected nicassio, may have killed katrina. so at considerable risk to herself, she's agreed to meet alone in a motel this potentially dangerous man. >> was she a little nervous? >> we all were. yeah! >> that was a petrifying evening. when you tell a 5'1" woman who is 22, 23 years old, and you have a person you think could possibly be a rapist and a killer, you know, it's not exactly a good day if god forbid