BROWNWOOD, Texas -

Another Baker's Dozen defendant was sentenced to prison.

In May, 13 arrests were made in a multi-agency operation involving drug trafficking through several counties in the Big Country.

40-year-old Keith "Boss" Martin was sentenced to 35 years in prison.

Martin pleaded guilty to possession of a controlled substance with intent to deliver and engaging in organized criminal activity.

Sam Moss with the Brown County District Attorney's Office, said Martin was a "regional drug supplier."

Martin remains in the Brown County Jail.

7 of the 13 involved in Operation Baker's Dozen have been sentenced.