Missing Witness / Who's Knocking (S05E13)

Title: Unseen Pursuit / Shadows at the Door Plot: In Miami, a man is shot execution-style in the middle of the day. Detective Freddie Ponce and his unit trace a blood trail leading them to an apartment complex, suspecting that the shooter may be lurking inside. Meanwhile, in Cincinnati, Detectives Doug Lindle and Matthew Thompson are on the case of a man killed outside his residence. They discover that just before his death, the victim had an unexpected visit from a stranger. To solve the murder, they must identify this mysterious guest who could lead them to the culprit.