Manuel Ortiz, 22, was accidentally shot in the head by his 19-year-old sister, Savannah Ramiriz, while they were posing with a gun for a Facebook photo. Ortiz died instantly.
Family and friends wept as his body was carried from his apartment in Phoenix, Arizona, where the shooting took place.
Police said 22-year-old Ortiz and his sister Savannah Ramirez arrived back at the home they shared on New Year's Eve after spending the night drinking.
They were with two other people when someone in the group pulled out the handgun to take photos with it.
As the 19-year-old posed and played around with the weapon it went off striking Ortiz in the head, according to ABC15.
He was pronounced dead at the scene.