On Wednesday morning, an unidentified gunman shot and killed UnitedHealthcare CEO Brian Thompson outside of a hotel in Manhattan. While police are still searching for any clues regarding the identity of the killer and his motives, strange new details regarding the incident are coming to light. The words "deny," "defend" and "depose" appeared on shell casings recovered at the crime scene, as law enforcement officials confirmed with CBS News — a puzzling new wrinkle in an unusual, "premeditated, preplanned, targeted attack," according to police officials.   Security footage shows the gunman walking up to the Hilton hotel in midtown […]