(AP) — A 20-year-old Wichita man has been convicted of capital murder in last year’s shootings of two people inside a Dollar General store.

A Sedgwick County jury deliberated less than 90 minutes Wednesday before finding Marquis Marshall guilty. Prosecutors were not seeking the death penalty, meaning Marshall faces a mandatory life sentence on each of the two counts.

Surveillance tapes from the November 2012 killings show a man entering the Dollar General holding a semi-automatic pistol and firing several times at 22-year-old employee Zachary Hunt and 79-year-old customer Henry Harvey. Both died at the scene.

No robbery occurred, and no motive has been offered by police or by witnesses who testified in the three-day trial.

Marshall was arrested two days after the killings during a traffic stop.