Mother's Day Murder

S2, E4: Mother's Day morning. A 58 year-old man lies dead in an open field. Detectives Nate Sowa and Ray Diaz inspect the body and discover the victim's cell phone is missing. Later they determine the phone was being used after the victim died, so there's hope for finding the killer. But when Sowa and Diaz confront the girl who received the calls, she denies knowing anything that could help the case. They close in on a pair of suspects, but because both are juveniles the detectives must build an airtight case and prove beyond a doubt who pulled the trigger.