PHOENIX (AP) — A 20-year-old Salt River Pima-Maricopa Indian Community man faces 34 years in prison for a killing that prosecutors say was motivated by a derogatory remark.

U.S. District Judge David Campbell on Monday sentenced Juan Carlos Burns for the Sept. 25, 2016 killing of Justin Gaston on a gas station on the Scottsdale-area reservation.

The U.S. Attorney's Office says Burns shot Gustin in the back of the head for making a derogatory remark to Burns.

Court documents don't specify what Gustin said.

A jury on Nov. 16 convicted Burns of second-degree murder and discharging a firearm causing death.