A 17-year-old shot his younger sister dead on Tuesday night when he accidentally unloaded a firearm into the back of her head.

Tedra King, 13, gave her big brother, Martaevious Santiago a hug on his 17th birthday. As she walked away through the family kitchen, her brother pointed a loaded semi-automatic handgun at the back of her head and pulled the trigger, police say.

Santiago called the police from his Florida City home to hand himself in, telling them it was an accident, reports the Miami Herald.

Santiago’s friends and family have echoed this, dubbing the killing a freak accident. His stepfather, Vernon Williams, told WSVN 7 News: “I can’t fault anyone for this here. It happened.”

Williams and Tedra’s mother, Lakesha Bess, were both at home when the fatal incident occurred.

Santiago has been previously embroiled in gun violence, and was featured in a WLRN series called Young Survivors earlier this year which told the stories of youth surviving gun violence.

Last year, Santiago was shot in the leg as he sat in a parked vehicle outside his home. His friend was shot in the head, but miraculously survived.

Earlier last year, Santiago’s 15-year-old brother, Martwan, was shot four times while playing outside his apartment.

In the documentary, Santiago said,

“I never knew how he was feeling until I got shot. Now, I feel the pain. Hang around the wrong crowd of people, this is what happens”.