The star passed away on 29 January (11) at her home in Manhattan, New York. She died of natural causes, according to Variety.
Brownstone shot to fame with radio appearances in shows opposite stars including John Wayne and Jimmy Stewart, while she also appeared on stage with Robert Redford and Alan Oppenheimer among others.
She also enjoyed stints on the small screen in programmes including Dragnet and The Nurses.
Brownstone is survived by two sons and a daughter, actress Diana Brownstone. Her husband, actor/director Joseph Brownstone, died in 1970.