Matt Roth and Laurie Metcalf
09/21/2011 AT 12:00 PM EDT
Laurie Metcalf is about to return to the single life.
The Roseanne star
, 56, who recently played Sheldon's mother on The Big Bang Theory
and her husband, actor Matt Roth, are splitting. Roth, 47, filed for divorce on Sept. 12 after six and a half years of marriage, citing irreconcilable differences.
The couple, who have been separated since November, 2008, have three minor children: Will, 17, Donovan, 11, and Mae, 6.
This was Metcalf's second marriage and Roth is requesting joint physical and legal custody of the children.
– Rennie Dyball