Double Agent 73 is a 1974 movie melodrama directed by Doris Wishman, starring Chesty Morgan, although her voice was dubbed due to her thick Polish accent. It was written by Judy J. Kushner Wishmans niece.
Morgan, a woman whose bust is 73 inches in size, plays Jane Tennay, a secret agent. Her agency wants her to assassinate, one by one, an organized crew of low grade heroin pushers. In order for her to prove her killings, they plant a tiny camera in her big left breast. Each time she needs a photo taken, she takes off her shirt and clicks over her left breast.Unlike the previous film, theres no smothering and only one death sequence involves her monstrous breasts. In it, she ambushes and ties up a guys girlfriend in their bathroom. She then rubs poison over her own breasts and climbs into the guys bed. Even though the light is on and disregarding the huge difference in breasts size, the sleepy guy thinks its his girlfriend. He starts kissing her large breasts and soon after dies from the poison. ........
Source: Wikipedia