By Jennifer Armstrong
April 06, 2010 at 03:33 PM EDT

Vanessa Redgrave’s actor-activist brother, Corin, died today at the age of 70 at home in England, Reuters reports. “He was taken ill at home in the early hours of Sunday morning,” a statement from his widow, Kika Markham, said. “He died very peacefully surrounded by his family. We will miss him so very much.” After his first stage role at the Royal Court in A Midsummer Night’s Dream, Redgrave went on to star in films A Man for All Seasons, Excalibur, and Four Weddings and a Funeral. He was also active in left-wing politics in the UK, launching a political party in 2004 as a reaction to the war on terror, which he said abused human rights. He was diagnosed with prostate cancer in 2000 and suffered a heart attack in 2005 while speaking at a rally, but returned to acting last year.