The celebrity news website said the couple met on the 2007 set of the film "Harry Potter and the Half-Blood Prince." They began dating four years later and recently had been living together in Radcliffe's New York apartment.
"She's trying to move on," Coker's father told The Daily Mail in London. "She won't want to talk about it."
When and why the couple broke up was not immediately known.
Notable deaths of 2014 [PHOTOS]