Tennessee ? A suspect in the 1975 slaying of a 9-year-old Girl Scout, who disappeared while delivering Girl Scout cookies, has been indicted by a grand jury, prosecutors announced Friday in Nashville, Tenn.

Nashville District Attorney Torry Johnson said Jerome Sidney Barrett was indicted by a grand jury Tuesday on charges of first-degree murder and felony murder. The charges were made public Friday after Barrett, who is in jail on charges in another 1975 slaying, was informed of the indictment.

Marcia Trimble disappeared from her upscale neighborhood Feb. 25, 1975. Her body was found 33 days later sticking out from a plastic wading pool in a neighbor’s garage, and authorities later said she had been strangled.

The case was Nashville’s most notorious unsolved murder for 33 years.

Barrett is awaiting trial on another murder charge in the 1975 killing and rape of Vanderbilt University student Sarah Vannatta Des Prez on Feb. 2, 1975.