The man credited with helping get the Ice Bucket Challenge go viral has drowned, Huffington Post online reported Wednesday.
Corey Griffin dove into the water off a wharf building in Nantucket, Massachusetts, just hours after reportedly helping raise $100,000 (S$125,000) for Lou Gehrig's disease charity ALS research.
The event was held to honour Griffin's friend, former Boston College baseball player Pete Frates, whose family and friends launched the challenge to raise awareness and funds for charity.
E!Online cited a police report which said that after jumping at 2am on Saturday morning, Griffin "floated to the surface" but his body "then went under water again not resurfacing."
Griffin's body was later recovered by an off-duty lifeguard and the 27-year-old was pronounced dead in hospital at 3am.
The Ice Bucket Challenge has been taking over social media as more and more high-profile figures undertake the challenge.