Maura Tierney files to divorce actor husband.
Maura Tierney, the actress best known for her role in the hit series "ER", is filing for divorce from Billy Morrissette, her husband of 13 years.
In court papers filed in Los Angeles, Tierney has cited "irreconcilable differences" as her reason for the split.
Tierney and husband Billy, who were married in February 1993, have been separated since March 7. The couple has no children.