Roseburg, OR -

Investigators say in court documents that a plot to steal medical marijuana led to the killing of a man Oct. 20 in Douglas County.

An affidavit quoted by the Roseburg News-Review says 27-year-old Buford Thomas Harper told detectives the plan was for him to restrain 57-year-old William Joe Bruton while accomplices grabbed Bruton's marijuana.

Harper told the investigators he hit Bruton repeatedly and then tried to restrain him with a choke hold. He said that when he realized Bruton was not breathing, he attempted CPR but couldn't revive him. Authorities say the robbers fled with the pot.

Harper and two other Myrtle Creek men have been charged with murder: William "Billy" Christopher Aguayo and Jarrad M. Ramsey. Both are 21.

Investigators are trying to determine whether others were involved.