A tweet from Erica Garner's official Twitter account said: "She passed away this morning. The reports are real. We didn't deserve her."
She had suffered major brain damage from a massive heart attack on Christmas Eve.
When you report this you remember she was human: mother, daughter, sister, aunt. Her heart was bigger than the world. It really really was. She cared when most people wouldn't have. She was good. She only pursued right, no matter what. No one gave her justice.— officialERICA GARNER (@es_snipes) December 30, 2017
Her mother, Esaw Snipes-Garner, said her daughter went into cardiac arrest during an asthma attack and had since been in a coma.
Snipes-Garner says her daughter suffered her first heart attack not long after giving birth to a baby boy in August. Doctors said the pregnancy had put a strain on her heart, which was later found to be enlarged.
Eric Garner died after a police officer subdued him with a chokehold in 2014. His last words were "I can't breathe," which became a slogan for activists.
Erica Garner appeared in campaign commercials for Sen. Bernie Sanders during his 2016 presidential run.