Confessed killer Joseph Beeson was formally sentenced Friday to a double life prison term without possibility of parole for the February murder of a Las Vegas convenience store clerk.

District Judge Miriam Shearing imposed the sentence on the Orem resident. The prison sentence automatically doubles under Nevada law because Beeson admitted the murder was committed with a deadly weapon.Beeson pleaded guilty to a charge of first-degree murder last month, three days before he was to stand trial for the Feb. 9 killing of Michelle Moore, a 21-year-old newlywed who was shot in the forehead at close range with a .45-caliber pistol.

In entering his guilty plea, the 18-year-old admitted he and his friend, Edward Bennett, planned to rob the convenience store located on Sahara Avenue about two miles east of the Las Vegas Strip. He said he saw Bennett, of Lehi, shoot Moore as a cash register drawer opened.

Beeson acknowledged he was pleading guilty in a plea bargain with prosecutors to avoid a possible death penalty if he had gone to trial and been convicted by a jury.

Bennett, 19, went to trial in September, was convicted of first-degree murder, and sentenced to death.