Anna Y. Mounger, a secretary at DEA's Miami Regional Office, died on August 5, 1974, as a result of the collapse of that building. She was 24 years of age at the time of her death.

Mounger graduated from the University of Houston in Houston, Texas, in 1972 with a bachelor’s degree in physical education. Mounger began working as a secretary for the Office of Drug Abuse Law Enforcement in Miami. In June 1973 she joined the Bureau of Narcotics and Dangerous Drugs as a secretary and was responsible for assisting with the day-to-day support functions, which are the key to successful enforcement operations. Ms. Mounger was planning on leaving the Drug Enforcement Administration at the end of the week to marry her fiancé, who was an officer in the Marine Corps.

Seven DEA employees died in the collapse of the Miami Office at 10:22 a.m. on August 5, 1974. Investigators determined that poor construction materials significantly contributed to the collapse of the structure.