William D. (Butch) Thomas Jr., 23, who was killed early Sunday when he was struck and dragged by a vehicle in Germantown, was a former Boy Scout, a volunteer with the YMCA and an employe at a lawn maintenance company in Wheaton.

Montgomery County police said Mr. Thomas was hit by an automobile after attending a bachelor's party Saturday night. They said Robert Frederick Parks Jr. of Silver Spring had been charged with manslaughter, reckless driving and leaving the scene of an accident in connection with the incident.

Mr. Thomas was born in Dover, Del. He and his family moved to Rockville in 1967 and later to Silver Spring, where Mr. Thomas resided at the time of his death. He attended Brookhaven Elementary, Parkland Junior High and Robert A. Peary Senior High, from which he graduated in 1976.

He was a member of Boy Scout Troop No. 1071 at St. jude's Church in Rockville. He was a Life Scout and a member of the Order of the Silver Arrow. He also had been a volunteer counselor at the Bethesda-Old Georgetown Road YMCA during his high school years and later. He had coached soccer and been a day camp counselor.

For the past five years, he worked for the Lawn By Stokes firm of Wheaton.

Survivors include his parents, William and Almeda Thomas, of Silver Spring; three sisters, Joan Bieard, of Silver Spring, Zelma Young, of Baltimore, and Annalouise Ragland, of Lawrenceville, Va., and one brother, Antonio, of Silver Spring.

The family suggests that expressions of sympathy be in the form of contributions to the Shriners Children's Hospital, Philadelphia, 19106.