Patrick H. Tompkins, 21, a medical corpsman in the Coast Guard who was born and reared in the Washington area, died Friday at Prince George's General Hospital as a result of injuries he received in an automobile accident earlier in the day.

A spokesman for the Prince George's County Police said Mr. Tompkins was east-bound in the 7000 block of Annapolis Road in Landover Hills when he was struck by a west-bound vehicle attempting to turn left. Police said the driver of the second vehicle, who was not injured, has been charged with manslaughter with a motor vehicle and driving while intoxicated.

Mr. Tompkins was born in Washington and grew up in Greenbelt. He was a 1978 graduate of Eleanor Roosevelt High School in Greenbelt, where he was active in the chorus and the drama club.

He had served in the Coast Guard for the past two years and was stationed at the Coast Guard dispensary in Baltimore. He was a resident of New Carrollton.

Survivors include his parents, Mr. and Mrs. Charles H. Tompkins, and two brothers, Christopher and Phillip, all of Greenbelt, and his grandmothers, Mabel Fasolt of Philadelphia, and Sarah Tompkins of Fredericksburg, Va.