Jackson County Sheriff Mike Byrd has pleaded guilty to a state felony and will resign immediately.
Byrd Thursday pleaded guilty in circuit court to one charge of intimidating a witness.
As part of Byrd's plea agreement, District Attorney Tony Lawrence dismissed 28 other felony charges and two misdemeanor offenses.
The 64-year-old Byrd will be sentenced March 12, 2014.
His resignation is effective immediately. He originally said in a letter to Jackson County supervisors Wednesday night that the resignation would take effect Dec. 31.
Mississippi law does not allow a convicted felon to hold public office.