A retired Fairfax County policeman and an Alexandria man were fatally wounded in two separate shooting incidents that occurred within moments of each other in Alexandria late Saturday night, according to police.

Billy J. Lamb, 47, of 3213 Campbell Dr., Alexandria, a retired 20-year veteran of the Fairfax County police force, was shot once with a handgun apparently during an argument at his residence shortly after 11 p.m. according to Fairfax County police. Lamb was taken to Mount Vernon General Hospital where he died at 6:40 a.m. yesterday morning.

Roland Mariable, 42, was killed by a single rifle shot during a domestic quarrel at 309 Hopkins Court, Alexandria at 11 p.m., according to Alexandria police.

Police later arrested Evalena Durham, 55, of the Hopkins Court address, and charged her with murder in the slaying.

No arrests have yet been made in the Lamb slaying. Fairfax County police said they were interviewing Lamb's wife, Kent, who they said was at home when the shooting occurred.

Lamb, who has been working for the past year at the Franconia police substation in Fairfax as a civilian police dispatcher, was "very well liked," by his coworkers, according to Faye Walker, a fellow dispatcher at the substation. "We depended on his knowledge, and he had a lot. He was good to work with," Walker said.

Neighbors who gathered yesterday in front of the Lamb's green and white bungalow in Burgundy Village, said Lamb was a "quiet man" who was fond of making plum jam for this neighbors.