A 21-year-old Rock Springs, Wyo., man pleaded guilty Monday to a misdemeanor count of aiding in the unlawful transfer of a firearm to a juvenile for his role in supplying a firearm to Trolley Square shooter Sulejman Talovic.
Matthew Hautala appeared in U.S. District Court before Judge Dale Kimball and was sentenced to a year on probation and a $250 fine.
Hautala became the third and final man to concede guilt in the transfer of a .38 special handgun that was one of two weapons Talovic used in February's shooting spree.
The rampage left five people dead and wounded four others before the Bosnian immigrant was gunned down by an off-duty Ogden police officer and Salt Lake officers responding to the scene.
Talovic was 18 at the time, but federal agents and prosecutors say he purchased the handgun in a clandestine meeting arranged in the parking lot of a Salt Lake City McDonald's restaurant when he was 17.
Brendan Taylor Brown, 21, has already pleaded guilty to selling a gun to a juvenile and was sentenced last month to 12 months probation.
Prosecutors say Brown and Mackenzie Hunter, 20, obtained the gun from Hautala in Wyoming.