LOS ANGELES (AP) — A former professional boxer convicted in the 1987 killing of his former manager has been sentenced to 11 years in prison.

Exum Speight, 51, was sentenced Tuesday in Los Angeles after pleading no contest to voluntary manslaughter.

Authorities say Speight stabbed, strangled and beat Douglas Stumler, 30, who was found dead in his West LA apartment.

Stumler worked for the Los Angeles County Housing Authority and worked on the side as a boxing manager.

He represented Speight for two years before they had a falling out.

In 1996, Speight lost a bout to Wladimir Klitschko, who’s currently the world heavyweight champion. Speight retired with a 9-39 record.

Authorities say DNA linked Speight to Stumler’s killing nearly a quarter-century after the crime.

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