OMAHA, Neb. (AP) — Authorities say a man imprisoned for an unrelated kidnapping conviction faces a murder charge in Omaha.

Omaha police say an arrest warrant for first-degree murder and a weapons count has been issued for 24-year-old Kevin Mariscal. He’s in Tecumseh prison, serving 15 years for a 2010 kidnapping in Sarpy County. Online court records don’t list the name of an attorney who could be contacted to comment on behalf of Mariscal.

Mariscal is suspected of killing 50-year-old Barbara Gonzales, of Omaha. Her body was spotted in a south Omaha residential alley by teenagers walking a dog on July 6, 2010. She’d been shot with a handgun.