Raphaël Coleman, a child actor who became a climate change activist, has died at the age of 25.

Coleman’s death on Friday was reported by his mother, Liz Jensen. His stepfather wrote on Facebook that he had collapsed while out jogging.

Coleman starred aged 11 opposite Emma Thompson and Colin Firth in the 2005 family comedy Nanny McPhee, and had subsequent roles in films such as It’s Alive, Edward’s Turmoil and The Fourth Kind.