PROVIDENCE, R.I. (AP) — A man who pleaded guilty to murder in a 2015 fatal stabbing in Providence has been sentenced to serve at least 23 years in prison.

WPRI-TV reports that 54-year-old Araya Brinkley was sentenced Friday to 50 years, with 23 he must serve. He was accused of stabbing 41-year-old Troy Henderson 15 times outside a convenience store in May 2015. Police say the two had been arguing inside the store before the stabbing.

Brinkley's cousin tells WPRI-TV that he believes Brinkley was acting in self-defense when he killed Henderson.

Brinkley's attorney said at his client's 2015 arraignment that Brinkley was honorably discharged from the Marines, worked as a full-time chef and had a 3-year-old son.

Brinkley will receive credit for three years already served.