Baseball analyst Steve Phillips was fired by ESPN on Sunday night less than a week after the former Mets general manager admitted having an affair with a production assistant at the cable network.

A representative for Phillips also announced the former Mets general manager was entering a treatment facility "to address his personal issues."

Phillips acknowledged Wednesday he had a relationship with 22-year-old Brooke Hundley.

"Steve Phillips is no longer working for ESPN," network spokesman Josh Krulewitz said in a statement. "His ability to be an effective representative for ESPN has been significantly and irreparably damaged, and it became evident it was time to part ways."

Phillips had taken a leave of absence after the affair became public. Krulewitz declined comment when asked Sunday night about Hundley's status with the company.

According to a police report filed in Wilton, Conn., Hundley began calling Phillips' wife, Marni, on Aug. 5 and sent her a letter graphically describing their relationship after Phillips broke it off.

Marni Phillips called police Aug. 19 when she came home to find Hundley in her driveway. "I knew instinctively that this was the woman Steve was involved with and I was terrified," she wrote in a statement to police.

Hundley also contacted Phillips' 16-year-old son through his Facebook account, according to the police report.

"This woman has clearly displayed erratic behavior and delusional tendencies," Steve Phillips said in a statement to police.

Phillips signed a statement to police that he would not press charges. The status of the police investigation was unclear Sunday.

In 1998, Phillips admitted having sex with a Mets employee, who sued for sexual harassment. That case was settled out of court.

Messages seeking comment were left Sunday for Phillips and Hundley.

The Associated Press contributed to this report.