David L. Reidy Jr., 18, who played high school and sandlot baseball in Prince George's County, was killed early Wednesday in an automobile crash in Camp Springs.

Prince George's County police said the car he was driving struck a parked car and then a tree in the 7100 block of Loch Raven Road.

Mr. Reidy played first base during his junior and senior years at Crossland High School in Camp Springs, where he graduated in 1979. Both years, he was named an All-County baseball player. He was to enter Springfield College in Massachusetts on a baseball scholarship this fall.

He also played baseball with the Camp Springs Boys and Girls Club and played in the finals of the clubs' National Baseball Amateur Championships for two years. He also was on the Clinton and Oxon Hill American Legion baseball teams.

Mr. Reidy was born in Washington and grew up in Camp Springs. He was working at the State Cleaners in Suitland at the time of his death.

He is survived by his parents, David L. and Marie P. Reidy, and a sister, Caludine P., all of Camp Springs; two half-sisters, Christine Cox of Arlington, and Sharon Irwin of Waldorf, Md.; a half-brother, Army Sgt. Spencer Andy Hill, stationed in Berlin, Germany, and his grandfather, Joseph Leo Reidy, of Newark, N.J.

The family suggests that expressions of sympathy be in the form of contributions to the David L. Reidy Jr. Memorial Fund at Children's Hospital National Medical Center.