Officer Tom Yannick appeared in the season 5 episode The Crimson Ticket. He was the killer of Callie Karlsen.
Officer Tom Yannick reported to a crime scene. Rex Lango had attempted to kill Callie Karlsen, but was killed by Callie instead. She called 9-1-1 and then passed out from shock. Officer Yannick showed up at the crime scene and saw the winning lottery ticket. So, he finished the job that Rex started. As he would have looked very suspicious having won the lottery, he conspired with Valerie for her to be the winner of the lottery and he and her would split the prize money.