Despite a tragic turn of events, the team narrows down the suspects.
Cassie and Sunny interview two of the suspects again and get closer to the truth.
Cassie and Sunny discover Walsh was chased by all four suspects on the night in question.
Cassie and Sunny interview the four suspects, who all deny knowing the victim.
Cassie and Sunny identify four potential suspects who trained as police officers together.
After making the decision to retire from the police force, Cassie faces a dilemma.