AN Alabama jailbreaker has pleaded guilty to the carjacking death of a British army major who was killed while on his way to a conference in New Mexico.

Roger Dale Yeadon, 25, admitted carjacking resulting in death at a US District Court on Tuesday.

He could now face a maximum of life in prison for killing Major David Nichols, the vice commander of the Defence School of Languages, who had been visiting training schools in Albuquerque and Texas when he disappeared in May 1996.

The FBI arrested Yeadon in Indiana two months later after Major Nichols' rental car, with his passport inside, was found submerged in a lake near Terre Haute, Indiana.

Major Nichols' decomposed body was found in a remote desert meadow south of Villanueva, near Las Vegas, New Mexico on September 25 last year - about four months after he disappeared.

Officials said he was apparently killed by two gunshots to the head that had been fired at close range.

Yeadon, who was in prison in Alabama for burglary, was being taken to court with another prisoner, Michael Wayne Thompson, when they escaped in May last year.

Thompson was charged in the Nichols case two weeks ago.

Yeadon has claimed that during the carjacking Thompson shot Major Nichols and then hid his body.

Major Nichols, 53, was reported missing after he failed to show up at the language conference he was travelling to in Alburquerque.

Based at the Defence School of Languages in Beaconsfield, Buckinghamshire, Major Nichols had recently separated from his wife when he went to America. The couple have three children.-AP