A 23-year-old male is believed to his taken his own life as a SWAT team descended on his house after he took a 5000km round trip to allegedly kill a teenager over an online gaming dispute.
Matthew Thane, 18, was shot dead about 6am on Tuesday at his home in Flower Mound, Texas.
On Wednesday night police in the California town of Pleasanton, close to 2700km away, moved to arrest the man they suspected was behind Thane's murder, but he is believed to have taken his own life before they could arrest him.
About 11pm he was found dead from a gunshot wound inside a house.