[s3e21] Past Imperfect <Simple>

While the "S3E21" tag most accurately fits CSI: NY , the title "Past Imperfect" is common in other series:

In this episode, Mac Taylor pursues a serial killer whose conviction is overturned after the arresting officer is jailed. [S3E21] Past Imperfect

Danny and Hawkes investigate the death of Scott Colson at Coney Island. They discover a woman dressed as a cowgirl who used an air gun to inject Scott with a lethal substance, eventually linking the crime to Scott's brother, Jesse. While the "S3E21" tag most accurately fits CSI: