GREELEY, Colo. (AP) — A 39-year-old northeastern Colorado man has pleaded guilty to his role in the October 2015 deaths of two Oklahoma men during a dispute over marijuana smuggling.

The Greeley Tribune reports Jack Larkin of Pierce pleaded guilty Tuesday to two counts of second-degree murder in the deaths of 23-year-old Josh Foster and 22-year-old Zach Moore of Muskogee, Oklahoma. Sentencing is set for September.

Larkin's half brother, Samuel Pinney, is serving life without parole for first-degree murder.

Investigators say Larkin, Pinney and Foster were part of a marijuana smuggling ring and that Foster tried to cut Pinney out of a deal.

Prosecutors say the shootings apparently occurred when Pinney and Larkin tried to rob Foster of $19,000 he had to buy marijuana. Foster brought his friend Moore with him.

The victims were found dead in a burning truck in Pierce.

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Information from: The Tribune of Greeley, Co, http://greeleytribune.com