Mr Prow was helping put up the stage at the Velodrome stadium in Marseille.
A Leeds technician killed while setting up the stage for a Madonna concert in France has been described by a friend as "one of the nicest people" he knew.
Charles Prow, 23, from Headingley, died overnight in hospital from injuries he suffered when a section of stage roof collapsed on to workers.
A French worker was also killed in Thursday's accident in Marseille.
Joe Bailey, who has known Mr Prow for two years, said: "He was a pleasure to know."
Technicians had been setting up the stage at the city's Velodrome stadium when the partially-built roof fell, bringing down a crane.
French worker Charles Criscenzo, 53, was killed outright.
Eight other people were seriously hurt, including an American who was hospitalised in a life-threatening condition.
Madonna said she was "devastated" by the news. Her concert, planned for Sunday, has been cancelled.
In a statement, Mr Prow's family said was "a much-loved son, grandson, brother, uncle and friend".
They said: "Charles was a happy-go-lucky guy with a big personality and he will be deeply missed."
Mr Bailey said he heard of the news on Thursday night.
"I couldn't believe it at first , it don't think it's really sunk in yet."
Firefighters said the roof became unbalanced as it was lifted by cranes
He added: "If you needed anything he'd always be there, if you ever wanted to do anything or go anywhere he'd always be up for it."
The 60,000-seater Velodrome is France's second-biggest sports arena and home to the Olympique de Marseille football club.
Firefighters said the accident occurred when the roof of the stage became unbalanced as it was being lifted by four cranes, toppling one of them.
Footage posted online shows Madonna making an emotional tribute to the technicians at her concert in Italy on Thursday.
She said: "Let's all just take a moment to say a prayer for Charles Criscenzo and Charlie Prow. Our hearts go out to their family and loved ones."