Derhon Towler said he spent part of Friday night shooting the breeze with his cousin, Tiquai Wallace, as the two sat on a carpeted stoop at Irwin and Meadow streets in Aliquippa.

When Mr. Towler, 18, left sometime before midnight, Tiquai, 15, stayed behind.

Mr. Towler said he was halfway home when a friend called to say a car traveling down Irwin Street had jumped the sidewalk and pinned Tiquai against the building, killing him. Injured was Jailynn Turner, 16, who had joined Tiquai on the stoop.

The driver fled, abandoning the car. But yesterday afternoon, Chaquille Pratt, 17, the 6-foot-3 leading scorer on the Aliquippa High School basketball team, turned himself in at the city police station to face charges in the crash, sources told the Pittsburgh Post-Gazette.

The sophomore forward led the Aliquippa team last season with 15.2 points and 5.9 rebounds per game as the team reached the quarterfinals of the PIAA tournament. Aliquippa head basketball coach Marvin Emerson declined comment last night.

Earlier in the day, city police Chief Ralph Pallante said investigators hoped a minister -- one of Tiquai's uncles -- would help to persuade the driver to surrender.

Police said the driver would be charged with homicide by vehicle, homicide by vehicle while driving under the influence, aggravated assault, driving while not properly licensed and other offenses. They said he would be charged as a juvenile and held at Allencrest Juvenile Detention Center in Beaver County.

Chief Pallante said he believed the driver lost control of the vehicle by accident.Tiquai was pronounced dead at The Medical Center, Beaver. Coroner Teri Tatalovich-Rossi said he died of compression injuries to his abdomen and chest after being pinned against the wall.

Jailynn injured a leg and wrist and was to undergo surgery at The Medical Center, according to her aunt, Shadi Gates, of McKees Rocks.

She said Jailynn hobbled to another aunt's house after the accident and said, "I just got run over by a car." Ms. Gates said relatives thought she was joking until she fell onto the couch, bleeding.

Jailynn's cousin, Kalan Hall, 15, said she was less than a block away when the car went onto the sidewalk. Later, Kalan said Jailynn wanted to return to the scene to see Tiquai.

"She said 'We were just sitting there, talking, laughing, together,' " Kalan said.

Friends and family members gathered there yesterday to leave stuffed animals, light candles and write remembrances on the wall. Chief Pallante said he did not know how fast the car was traveling, although he said it would have been difficult to accelerate to a high speed on the residential street.

Still, Tiquai had no time to react when the car came over the sidewalk.

"He was always quick on his feet," Mr. Towler said, recalling childhood days when the two would tease each other and then run to their grandmother to see who could tattle first. Mr. Towler said his cousin usually won.

Chief Pallante said the car was owned by a Hopewell woman acquainted with the driver. He said she was "somewhat cooperating" with police.

Tiquai was nicknamed "Goldie" because of his hair color and "Wall Street" because of his last name. Mr. Towler said he played ninth-grade basketball for Aliquippa High School and had a comedic personality.

"He was just one of the best people you could be around," he said.