Hansard had just finished a song on Thursday night at Saratoga Mountain Winery in California, when the man landed just yards from him and died.
Hansard was playing with fellow Oscar winner Markéta Irglová of the Swell Season and their crew.
The audience watched in horror when the man fell from the roof of a building near the lighting rig, according to local reports. Many in the audience were shaken and in tears.
“The band, crew and all involved with them are shocked and saddened by the unfortunate events of last night,” said the band’s statement.
“Their hearts go out to the victim and his friends and family.”
The San Jose Mercury News reports that Hansard had just finished a song and was indulging in some banter with the crowd and guitar player when the man fell.
Hansard put down his guitar and walked over to the man on the stage, while doctors in attendance attempted to revive him. Sheriff’s authorities and paramedics attended the scene. The audience realised he had died when his body was not moved following unsuccessful attempts to resuscitate him.
Hansard began his musical career as a busker on Dublin’s Grafton Street before forming The Frames in the late 1980s. He began performing and recording as The Swell Season with Czech musician Markéta Irglová in 2006.
They rose to prominence after they starred in the Dublin-based film Once. The Swell Season received an Academy Award in 2008 for the best original song for Falling Slowly, which featured in the film.