Dermot Mulroney and Prima Apollinaare’s marriage has crashed.

 

The Chicago Fire star filed for divorce from his wife of almost 15 years on June 23, citing “irreconcilable differences” as the reason for the breakup in court documents.

 

Mulroney did not list an official date of separation in the filing.

 

Mulroney, who shares daughters Mabel Mulroney, 17, and Sally Mulroney, 15, with his ex, is seeking joint legal and physical custody of their kids.

 

The paperwork said Mulroney is requesting spousal support from Apollinaare—who was initially named Tharita Cesaroni but legally changed her name in 2015. A source close to the pair told E! News that the 61-year-old and his ex were “advised to file this way.”

 

The source added that between Mulroney and Apollinaare, “No one is asking for anything, and no one is denying anything. They are not arguing over money or the children.”

 

The source added, “They used mediators, not lawyers, as they are friends and this is amicable.”

 

Prior to his relationship with Apollinaare, Mulroney was married to actress Catherine Keener from 1990 to 2007. The two are parents to 26-year-old son Clyde Keener Mulroney.