Two Washington men were charged yesterday with the March 1 slaying of William Henry Bell, the 18-year-old gasoline station attendant who was abducted at gunpoint after he refused to hand over a fistful of cash and then was shot to death moments later.

D.C. police said they charged Samuel Lewis Byrd, 26, of 2605 Bowen Rd. SE, and Dickey Arnold Williams, 22, of 2005 Fourth St. NE, with homicide in the killing, which occurred during a driving snowstorm.

Both Byrd and Williams had previously been charged with the recent armed robberies of Leon's Clothing Store, at 641 D St. NW, and the Geisha House Inc., at 2009 K St. NW, police said. The investigation of those robberies led to the arrests in the Bell slaying, police said.

Police said they have identified a third suspect in the slaying, who is already under arrest and being held in the Prince George's County jail in connection with a Maryland armed robbery.

Bell, an attendant at Johnson's Texaco at 1234 Good Hope Rd. SE, was pumping gasoline about 7 p.m. on March 1 when three men in a stolen blue Mercedes drove into the station. Bell pumped fuel into the car and then one of the men pulled out a gun and demanded the money -- perhaps $500 -- that Bell was carrying.

When Bell refused, he was shoved into the car and driven off. He was found a short time later, staggering on snow-covered T Street with a gunshot wound in his back. He died a short time later.