'ER' star Maura Tierney has filed for divorce from her husband of 13 years, actor Billy Morrissette.
People magazine reports that court papers filed in Los Angeles state that 41-year-old Tierney and 43-year-old Morrissette have been separated since 7 March. They have no children.
Among Tierney's screen credits is 'Scotland, PA', which Morrissette directed.
