With no suspects in Maria Bruno's murder, L.A. County Sheriff's Deputy Detective Mark Lillienfeld continues the search. Michael Gargiulo marries, then moves to Santa Monica, California, with his wife. Across the alleyway, 26-year-old Michelle Murphy lived in an apartment nearby. One night, Murphy woke up with a man on top of her, stabbing her repeatedly with a knife. She manages to kick off the attacker, who cuts himself in the struggle and flees the apartment. When police arrive, they find blood at the crime scene that matches Michael Gargiulo, and he's eventually arrested for the attack. When L.A. County Sheriff's detectives who were investigating Maria Bruno's murder find out, they search Gargiulo's old apartment in El Monte and find a key piece of evidence. With Gargiulo now in custody, CBS 48 Hours airs a special about Tricia Pacaccio's murder in Cook County, which leads to a break in the case. We speak with CBS correspondent Maureen Maher about the special, plus former Santa Monica Police lieutenant Darrell Lowe about the attack on Michelle Murphy, and Mark Lillienfeld details the search of Gargiulo's El Monte apartment and a controversial undercover operation conducted while Gargiulo was in custody.