Law & Order: Criminal Intent Episode 4.21 The Unblinking Eye

STREET SHOOTINGS RAISE PUBLIC OUTCRY AS POLICE PROBE FEMALE STALKER -- AND HIGH-TECH TREASURE HUNT GAME -- After a young actor Mike, (guest star Jeffrey Hephner) is wounded and his fiancee is shot dead on the street, Detectives Goren (Vincent D'Onofrio) and Eames (Kathryn Erbe) are pointed towards the surviving victim's former girlfriend, who is known to have stalked him. The key, however, might turn on their probe of "geocaching," a high-tech treasure-hunt game that could yield vital clues. As the media and public mourn the man's tragic loss, the police want to take another look at some of his acting buddies, especially one who never lets go of his Palm Pilot.