OMAHA, Neb. (AP) — A man undergoing his second trial for murder in the 2016 shooting death of an Omaha teenager has been found not guilty.

A Douglas County jury on Tuesday found Otis Walker, 25, not guilty of first-degree murder and gun charges in the Nov. 26, 2016, drive-by shooting death of 16-year-old Markeise Dunn, the Omaha World-Herald reported.

Prosecutors had argued that it was Walker who pulled the trigger when a car pulled up beside Dunn, who was walking his girlfriend to a bus stop, and opened fire. Prosecutors relied on several pieces of circumstantial evidence, including the testimony of the girlfriend who identified Walker as the shooter. Investigators also found Walker had repeatedly searched online news reports about Dunn’s killing and the girlfriend’s Facebook page. He also had entered a search term for “good Omaha defense attorneys,” prosecutors said.

But Walker’s defense attorneys argued that police had failed to thoroughly test items in a car suspected of being used in the killing found two miles from the shooting scene. The defense team also said detectives had been looking at another suspect as recently as last year.

Walker’s first trial ended in a mistrial in 2019 when jurors couldn’t reach a verdict.

The jury did find Walker guilty of witness tampering. Walker faces up to 20 years in prison on that count when he’s sentenced at a later date.