The warden of a prison ranch where 100 convicts raise cattle and catfish was bludgeoned to death, along with his wife and two inmates. Then the killer burned all four bodies in a house fire.

Charlie Farquhar was killed after he stumbled on the grisly murders of his wife, Doris, and the two prisoners when he returned from his Sunday morning walk, authorities said. The couple lived on the prison grounds.An inmate, Kelvin O'Neal Washington, was arrested on the ranch property hours later. Hale County Sheriff Larry Johnson said he expected capital murder charges would be filed Monday against Washington, 27.

The sheriff said Washington, who is serving 20 years for theft and the attempted murder of a police officer, apparently was angry over being ordered gather pecans instead of getting the weekend off.

State Attorney General Jimmy Evans said Farquhar, 74, and his wife, 68, were bludgeoned to death with the same gun used to shoot Clifton D. Martin, 44, and Paul Leverett, 60. Both the inmates were serving life sentences for murder.

The Charles A. Farquhar State Prison Ranch, started in 1956 and later named in Farquhar's honor, is a minimum-security compound where prisoners with good conduct records are assigned to work. They are free to roam the grounds.

The Farquhars' house was down a narrow road from the ranch gates and a quarter mile from the prison barracks, where inmates milled about near an open door discussing the killings.