D.C. police arrested a 16-year-old Southeast youth yesterday in the fatal shooting Sept. 22 of a 61-year-old clerk in a liquor store on Capitol Hill, homicide investigators said.

The identity of the juvenile suspect was not disclosed, but officers said he was charged with felony murder in the shooting death of Charles Joseph Errico Sr. of Capitol Heights. The youth will be arraigned today in D.C. Superior Court, authorities said.

Police said a warrant had been obtained for the suspect after the incident, and that he was arrested at about 6 p.m. at Ives and K streets SE. Homicide Detective Norman Brooks said other arrests are expected in the case.

Errico, a clerk at the Hollands Beverage Mart at 1301 Pennsylvania Ave. SE, was working in the store about 1:15 p.m. when an armed man entered and demanded money, police said. Errico was shot during what officers said was an attempted robbery, and was taken to D.C. General Hospital, where he died about an hour later.

Errico was well known and highly regarded in the neighborhood where he had lived and worked most of his life, according to neighbors and friends. Known to many by the nickname "Mister Charley," Errico once lived in an apartment above the store, then a grocery.

Errico left his job there in 1956 and moved to Capitol Heights. After a fire destroyed the grocery and the liquor store opened in its place, Errico returned to work as a clerk.

Errico is survived by his wife, Mary Sybil Errico, 62, and a son, Charles Joseph Jr, 37.