Apparently MC did an interview with Doctor Phil a day or two before confessing to the police.
http://xfinity.comcast.net/articles/news-entertainment/20121001/US.Slain.Woman.Dr.Phil/
In a brief statement, Stacey Luchs, a spokeswoman for the "Dr. Phil" show said, "Mr. Castellano sat down for an interview with Dr. Phil in Texas just before his confession to law enforcement, late last week. Dr. Phil also conducted an interview with Ms. Warner's family for this show, which is currently scheduled to air on Thursday."
http://xfinity.comcast.net/articles/news-entertainment/20121001/US.Slain.Woman.Dr.Phil/