Patrick Quinn, who helped drive the global phenomenon known as the Ice Bucket Challenge to tackle a deadly neurodegenerative disease, has died at the age of 37.
Quinn was diagnosed with amyotrophic lateral sclerosis, or ALS, in 2013.
"We will always remember him for his inspiration and courage in his tireless fight against ALS," his team wrote on Quinn's ALS advocacy Facebook group.
American Quinn helped make the Ice Bucket Challenge a global phenomenon.
Millions took up the challenge, which involved dousing themselves with a bucket of ice cold water and posting the video online, before making a donation to medical research. Celebrities took part, including Tom Cruise, Bill Gates and even former US president George W Bush.
The campaign raised US$220 million (HK$1.716 billion) to fund research into ALS.
The ALS Association thanked Quinn for co-founding the initiative and mourned his death. "Pat fought ALS with positivity and bravery," the group said.