Season 1, Episode 21 Maternal Instincts

First Aired: April 25, 2004

The 1989 murder of a young mother is reopened when the woman's teenage son, who witnessed the crime when he was 3 years old, is brought in for petty theft and starts talking. The investigation reveals that the boy's slain mom may not have been who she claimed to be. Valens: Danny Pino. Lilly: Kathryn Morris.