Here's the other feminist I was trying to remember --
Andrea Dworkin. She also died in her 50's -- cause of death "unknown" but she was obese too, as I recall. From the link in this post:
Feminist icon Andrea Dworkin dies
Monday April 11, 2005
The American feminist icon, writer and campaigner Andrea Dworkin, who linked pornography to rape and violence, died at the weekend, her agent said today.
She was 58 years old....
Ms Dworkin's agent, Elaine Markson, said the cause of death was not known, but she had become increasingly frail as her knees had weakened and she suffered a series of falls. She died at the home in Washington DC she shared with John Stoltenberg, her partner of 30 years and husband since 1998.