A 19-year-old man who allegedly belongs to a Northwest Washington street gang has been charged with murder in a fatal shooting last week on the football field at Roosevelt High School, D.C. authorities said yesterday.

Oswaldo Urquilla and another man, who remains at large, shot Willian Pineda Lazo, 20, and a 16-year-old male the afternoon of Oct. 29 as part of a continuing feud between two Latino street groups, according to charging documents filed by prosecutors.

Urquilla was arrested Friday evening and was arraigned Saturday in D.C. Superior Court.

According to the charging documents, Lazo, a former Roosevelt student, and others were gathered on the field, which police described as a meeting place for a gang called STC. A member of Lazo's family said last week that he had been affiliated with the gang for about a month.

Urquilla was identified by police as a member of a rival gang known as Vatos Locos. He and three other men approached Lazo's group about 2:25 p.m. and asked who among them was from STC, authorities said. "Several people . . . said they were not with STC," according to the charging papers.

Then two in Urquilla's group pulled guns, police said. One fired at the 16-year-old, who was in Lazo's group, wounding him in the arm. Police said the gunman handed his gun to Urquilla, who chased Lazo while shooting at him. After Lazo fell, collapsing on the school track near the field's scoreboard, Urquilla ran up and fired another shot at him, according to the charging documents.

Lazo was shot in the body and neck and was pronounced dead soon after arriving at Washington Hospital Center. The teenager, who has not been identified, survived. Most of Roosevelt's 821 students were at an assembly in the school's auditorium when the gunfire began.

The charging documents said the feud between STC and Vatos Locos had been unfolding for several weeks. Urquilla was assaulted Oct. 26, three days before the fatal shooting, apparently as part of the feud, the documents said.

Urquilla is jailed without bond on a charge of first-degree murder while armed, authorities said. Police said he lives in the Lanham area, but court records said he resides in the 4100 block of 14th Street NW, in the same building where Lazo lived with his family.

Police said last week they were seeking warrants for three other suspects, but a spokesman said last night that Urquilla was the only person arrested in the case so far.

D.C. Council member Adrian M. Fenty (D-Ward 4) praised police for capturing Urquilla.

"I think, personally, it will deter crime if people know they will get arrested that quickly," Fenty said.