In a quick verdict, a jury Friday decided a Duncan teenager intentionally killed an Australian baseball player out for a jog on a summer afternoon in 2013.

The jury found Chancey Allen Luna, 17, guilty of first-degree murder, rejecting his defense attorney’s claim that he only had been trying to scare the jogger.

The victim, Christopher Lane, 22, was in Oklahoma on a college baseball scholarship and was in Duncan visiting his girlfriend, Sarah Harper. He was shot in the back just before 3 p.m. Aug. 16, 2013, while jogging along Country Club Road in north Duncan.

The drive-by shooting quickly became known across the country and overseas as a thrill killing after Duncan’s police chief said another teenager, the car’s driver, had revealed their motive was boredom. Prosecutors, though, told the jury Friday they don’t know Luna’s motive.