Cole Bixler, a teenage boy killed his cousin and her boyfriend during a sleepover before turning the gun on himself, police believe, according to Daily Star UK.

Cole Bixler, 14, was staying with Mason George, 21, and his partner Jessica Bixler, 22, at a home near Owensburg in Indiana, the US, on Friday, April 16.

Officers believe he shot Mason with his own handgun while he was sleeping on the couch.

The child then shot Jessica in the bedroom before taking his own life, it is claimed.

Her mum Amanda Mosier discovered the bodies and called the police.

Officers say Cole had discussed self-harm before the tragedy.

Amanda afterwards posted on Facebook: “My heart is broken. We lost Cole Bixler, my Jessica Gail Bixler and Mason George.

“Jason Mosier and I have no words. We appreciate all the prayers, but we likely won’t answer the calls and texts much at this time.