Detective Lilly Rush is a fictional character from the television series Cold Case, which aired from 2003 to 2010. She works for the Philadelphia Police Department and specializes in solving cold cases—homicides that have remained unsolved for years. Lilly is known for her tenacity and empathy, often connecting with the victims' families to uncover the truth. Throughout the series, Lilly collaborates with her team, including Detective Scotty Valens and Captain John Stillman, to investigate past crimes. The show often features flashbacks that reveal the circumstances surrounding each case, providing viewers with a deeper understanding of the victims and their stories.