A 15-year-old Fairfax County youth accused of shooting a 17-year-old Fort Hunt area girl to death Tuesday was ordered held in a juvenile detention facility yesterday after a judge refused a request that he be released in his mother's custody.

The judge, Philip N. Brophy of Fairfax County Juvenile Court, also scheduled a hearing, similar to a preliminary hearing in an adult court, for the youth on July 26, according to Vincent T. Pacciano, director of the Juvenile Court.

The youth is charged as a juvenile with the equivalent of an adult murder charge.

Police said the girl, 17-year-old Caroly Jean Cordon of 1402 Middlebury Dr., was found dead Tuesday afternoon at a house in her neighborhood. She had been shot once through the heart with a small caliber rifle, according to Fairfax Commonwealth's Attorney Robert F. Horan Jr.

Horan said the shooting occurred after an altercation involving "some teasing," but he would not elaborate.

Carolyn, the daughter of Allen and Jean Cordon, would have been a senior at Fort Hunt High School this fall. Stewart Christiano, an assistant principal at the school, described her yesterday as "a normal, average kid."

She had done junior volunteer work at Munt Vernon Hospital since last April, according to Mary Howland, a hospital official who described her as "a very likable girl and an excellent volunteer."

Robert Cordon, Carolyn's 19-year-old brother, said she was "relatively quiet and liked animals."

Her father is an assistant to Federal Communications Commissioner James H. Quello, according to FCC officials. Her grandfather was the late U.S. Sen. Guy Cordon (R-Ore.), who served from 1944 to 1954.

Survivors include a second brother, Michael, 13.