A San Saba County man who was arrested during the Operation Baker's Dozen drug roundup four months ago is dead of a gunshot wound, and another man who was arrested in the roundup has been sentenced in federal court, authorities said.

Bobby Joe Verette, 52, one of 13 defendants targeted Operation Baker's Dozen an investigation into narcotics trafficking was dead in a vehicle Monday afternoon about four miles west of San Saba, San Saba County Sheriff Allen Brown said.

A 9-1-1 call was placed "by someone he was with," Brown said, declining to elaborate. Brown released little information on the shooting, and said all possibilities from murder to suicide to accidental are being examined.

"It is just a wide open investigation. We're opening every door, looking in every closet," Brown said.

The Texas Rangers and the sheriff's office are investigating the death, Brown said.

Verette, who had a drug case pending in Brown County, was alleged to have been delivering methamphetamine in San Saba County under a man named Keith Martin, 39, Brown County sheriff's investigator Jason Benefield said. Martin was also arrested in Operation Baker's Dozen and was sentenced earlier this month in federal court to 22 1/2 years in prison, according to records with the Waco division of U.S. District Court in the Western District of Texas.

Martin was sentenced after pleading guilty in July to drug and firearms-related charges.

Investigators believed Martin participated in methamphetamine trafficking that involved several high-level drug dealers in numerous Texas counties, Benefield said. Martin lived in several locations including Brown County, where he rented a travel trailer off County Road 134, he said.