Dawn Vanessa Anderson, 18, whose body was identified Monday by Maryland State Police, was a resident of Capitol Heights and a 1980 graduate of Bladensburg High School.

Police said that Miss Anderson was last seen alive on March 21 when she left the home of her parents, Lee V. and Colleen Anderson, in District Heights, and was reported missing. Her body was discovered by a passerby the next day in a park in Severn, Md.

Miss Anderson was not immediately identified because she had been badly beaten and burned, police said.

A spokesman for the Maryland state medical examiner in Baltimore said she died as a result of cranio-cerebral trauma.

A native of Washington, Miss Anderson had lived in Capitol Heights for the past 10 years. She had been active in scouting, working her way from Brownie to senior Girl Scout.

She spent the summer of 1979 as a clerk-typist with the Navy Department in Crystal City and had worked as a waitress in a drugstore and employe in beauty salons.

During her years in high school, she was a cheerleader, played basketball and participated in track. She held a black belt in karate and won 28 trophies in competition.

In addition to her parents, survivors include two sisters, Verna L. and Natalie A. Anderson, and a brother, Lee V. Jr., all of Capitol Heights, and her grandparents, the Rev. Isadore and Mary Richards, and Lucious and Ruth Anderson, all of Washington.