Jeanne Manford, who founded the straight ally group Parents and Friends of Gay and Lesbians (PFLAG) in 1972, died on Tuesday (8 January) at the age of 92.
Manford had been in declining health for some time.
'All of us - people who are lesbian, gay, bisexual, transgender, and straight allies alike - owe Jeanne our gratitude,' PFLAG officials said in a statement. 'She paved the way for us to speak out for what is right, uniting the unique parent, family, and ally voice with the voice of LGBT people everywhere.'