(AP) — A 19-year-old Kansas man has been sentenced to spend the rest of his life in prison without parole for killing two people inside a Wichita Dollar General store late last year.

Marquis Marshall spoke few words Wednesday at his sentencing hearing. He was convicted in October of capital murder in the Nov. 30, 2012, fatal shootings of 22-year-old store employee Zachary Hunt and 79-year-old customer Henry Harvey.

Prosecutors say they still don’t know why Marshall shot the victims. A Sedgwick County jury deliberated less than two hours Oct. 2 before convicting Marshall. His defense lawyer presented no evidence at his trial, and a motive for the shootings was never disclosed.

About two dozen relatives of Harvey and Hunt attended the sentencing hearing.