During the investigation of the gang shootout, the police officers are questioned and presented with evidence that suggests that Ross was killed by friendly fire; Carlos learns that Vangie is dead and that he is the father of the baby her sister leaves at the firehouse; on the first anniversary of Bobby's death, Kim quarrels with Jimmy over her visitation with Joey and confronts a female gang during a call; and Doc is visited by the father of a former patient whose debilitating injury may have been caused by Doc's error during treatment.

As Carlos desperately searches for a bone marrow match for Kylie, he digs deeper into his own past and discovers that he wasn't abandoned by his parents, but was found clinging to his dead father's hand after a car accident; after a local station picks up the story, Carlos gets a call from a woman claiming to be his mother; Bosco and Monroe find themselves going after a small-time mobster putting the squeeze on an honest family-run linen company after the son of the linen company owner dies in a suspicious fire.