Steven W. Stagg, 16, a student at Seneca Valley High School in Gaithersburg who was the victim of a hi-and-run accident on Clopper Road in Gaithersburg on Feb. 21, died Monday at Suburban Hospital in Bethesda of injuries suffered in the incident.

Police said that Steven was walking west on Clopper Road, a few feet behind two friends when he was struck from behind and thrown head first into woods just off the shoulder of the road.

Montgomery County police are seeking the driver of the hit-and-run vehicle, which is believed to be a 1978 Pontiac Catalina four-door sedan. The car is said to be metallic green with possible damage on its right side.

Steven was a native of Montgomery County. He attended Julius West Junior High School the Richard Montgomery High School in Rockville before moving to Gaithersburg.

His hobbies included skate-boarding and wrestling and he had published a story in his junior high school's literary magazine. He was a member of the Montgomery Community Church in Gaithersburg.

Survivors include his father, Phillip, an officer in the Montgomery County Police Department who lives in Germantown, Md.; his mother, Diane Stagg, and a sister, Judy, Both of Gaithersburg; a brother, Michael, of Ocean City; his grandparents, Mr. and Mrs. Harold Stagg of Bethesda and Mr. and Mrs. W. Wallace Fritz of Piscataway, N.J., and a great-grandmother, Alice N. Ward of Bethesda.

The family suggests that expressions of sympathy be in the form of contributions to Children's Hospital in Steven's name.