Vendetta (1986 film)

Vendetta is a 1986 prison action movie starring Karen Chase and Sandy Martin. It was released in September 1986.

Bonnie learns the realities of prison life when she draws the sexual interest of Kay Martin, an influential trustee inmate who soon shows herself to be capable of making life miserable for the youngster. One night Bonnie is touched inappropriately by Kay, and fights back. Bonnies victory is shortlived, however, as Kay and her gang assault her and inject her with heroin before dumping her over a railing several floors up and to the floor below, resulting in her death.The next day, Laurie is called to claim and identify her sisters body. She sees on the report that her sister had died of a drug overdose, but when she sees her sisters dead and visibly bruised body in the morgue, Laurie concludes that a coverup is being engineered by the authorities, and is determined to find out the truth. ........

Source: Wikipedia