Update: Oklahoma City man charged with first-degree murder in mother's shooting death

An Oklahoma City man has been charged with first-degree murder after police say he confessed to killing his mother this month.

At about 2:17 p.m. Sunday, police responded to a shooting at an apartment in the 5300 block of NW 42 Street near N Ann Arbor Avenue.

Investigators said 49-year-old Shane Smith contacted emergency services, leading authorities to find 76-year-old Connie Smith lifeless inside their residence.

According to charging documents, Smith claimed the act was part of a prearranged agreement with his mother to end her suffering by killing her if she became disabled by illness

More: OKC man accused of shooting, killing his mother

Authorities are looking into the woman's health condition leading up to the homicide and the investigation is ongoing.

This shooting marks the 50th homicide in Oklahoma City this year.

This article originally appeared on Oklahoman: OKC man charged with first degree murder says it was assisted suicide