TUCSON, Ariz. (AP) — Authorities say a Tucson man is in custody after he allegedly shot and killed his neighbor at an apartment complex.

Tucson police announced Thursday that 56-year-old Gregory Walters has been booked into the Pima County Jail on suspicion of second-degree murder.

They say Walters called 911 around 5 p.m. Wednesday to say he'd shot his neighbor several times during an argument.

The neighbor was found dead inside Walters' apartment.

He's been identified as 53-year-old Wade Lockwood.

It's unclear if Walters has a lawyer yet.