Former child actor Raphaël Coleman, who appeared in Nanny McPhee, has died at the age of 25.
His mum and stepfather took to social media to say their son had passed away after collapsing while out on a run on Friday.
Carsten Jensen wrote on Facebook that Coleman had no "prior health problem" when he tragically died.
Coleman shot to fame in 2005 after appearing as Eric Brown in the hit film Nanny McPhee.
Throughout his movie career he also had roles in It's Alive, Edward's Turmoil and The Fourth Kind.
His mum Liz tweeted about the sad news on Friday, saying he died "doing what he loved" and had been an activist with Extinction Rebellion in the last few years of his life, earning himself the nickname Iggy Fox within the group, the Mirror reports.
Liz wrote: "Rest in peace my beloved son Raphael Coleman, aka Iggy Fox.
"He died doing what he loved, working for the noblest cause of all. His family could not be prouder.
"Let's celebrate all he achieved in his short life and cherish his legacy."
Mr Jensen, who is married to Raphaël's mother Liz, said Raphaël wanted to be a scientist.
He wrote: "I will never forget you, we say in a farewell greeting to the dead. But when it's your own child, it's your genes, your whole body, something greater than the word I who forever refuse to accept the judgment of death.
"Raph wasn't my child, even though I was close to him. But I can feel it myself. I see it in his mother's eyes, and I hear it in her voice, the irreversible loss of the most precious thing in life.
Mr Jenson said Raphaël ran the Extinction Rebellion's social media accounts and was arrested "again and again" at protests.
Liz also posted another tribute to her son on Saturday.
She tweeted: "RIP Iggy Fox, aka Raphael Coleman. He knew that we are all already in Heaven, right here on Earth."
