A fan died while dancing in the crowd at Grateful Dead offshoot band Dead & Company's concert at San Francisco's Golden Gate Park over the weekend, reports say.

Trey Anastasio of Phish, Billy Strings and Sturgill Simpson were among the special guests to join the band over three nights of concert and amid a city-wide celebration.

Trey Anastasio, Sturgill Simpson and Billy Strings joined the Grateful Dead offshoot for three San Francisco shows celebrating 60 years of Grateful Dead music.