Follow CBSDFW.COM: Facebook | Twitter

ABILENE (AP) — A West Texas man must serve 55 years in prison for the 2014 fatal shooting of his girlfriend and the wounding of their newborn son in her arms.

KTXS-TV reports Chevayae Johnson was sentenced Wednesday in Abilene in a plea agreement.

Johnson pleaded guilty to murder and received 55 years behind bars. Investigators say 22-year-old Makayla Bunting was slain in June 2014 at an apartment.

Johnson received 20 years in prison for injury to a child — his then-2-week-old son. Police say the baby suffered a hand wound from the same round that killed Bunting.

The sentences run concurrently.

Johnson was treated for a self-inflicted gunshot wound. Police initially thought Johnson died at the scene, but he regained consciousness and attacked officers, who subdued him using a stun gun.

(©2016 CBS Local Media, a division of CBS Radio Inc. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed.)