A jury has convicted former death row inmate Mark Lankford of killing a Texas couple in 1983 in north Idaho.

Lankford was granted a new trial after the 9th U.S. Circuit Court of Appeals ruled he must be retried or released because of a jury instruction error in his first trial.

Jurors in Wallace, Idaho, deliberated not quite four hours before finding Lankford guilty of two counts of first-degree murder in the beating deaths of 27-year-old U.S. Marine Capt. Robert Bravence, and his 24-year-old wife, Cheryl Bravence.

Lankford and his younger brother, Bryan Lankford, were convicted of the deaths in 1984. Mark Lankford was sentenced to death; Bryan Lankford is serving a life sentence.