(KLZA)-- The man convicted of the December 1999 shooting death of 84-year-old Tennyson Kelsay  in Auburn has died in prison.

64-year-old Russell Harms was serving a life sentence for first degree murder and use of a deadly weapon to commit a felony when he died Monday in the Reception and Treatment Center in Lincoln.

Harms was sitting in his pickup in the parking lot of an Auburn store when he shot Kelsay 15 times.

A grand jury will conduct an investigation into Harms' death as required whenever an inmate dies in the custody of the Nebraska Department of Correctional Services.