CLAIMING TO BE DESPERATE TO FIND THE MISSING MOTHER OF HIS CHILD, A TEXAS MAN TALKS WITH DR. PHIL MCGRAW, BUT WITHIN 48 HOURS HE TELLS POLICE A MUCH DIFFERENT STORY

"48 HOURS" INVESTIGATES WHAT REALLY HAPPENED TO MICHELLE WARNER IN "GONE" - SATURDAY, FEB. 7, 2015

Claiming to be desperate to find the mother of his son who suddenly vanished, a Texas man talked with Dr. Phil McGraw on his top-rated daytime talk show. But, just a mere 48 hours after telling McGraw one story, he told police another, which turned the investigation upside-down.

Michelle Warner vanished without a trace from Houston, Texas, in September 2012. At the time, she was living there with an on-again, off-again boyfriend, Mark Castellano, who was also the father of their 3-year-old son, Cayden. Castellano told Michelle's family and police she stormed out after they had a fight, leaving Cayden and her car behind. She was never seen alive again.

Tracy Smith and 48 HOURS investigate the disappearance of Warner and the unusual path Castellano took to tell his story in "Gone," to be broadcast Feb. 7, 2015 (10:00 PM, ET/PT) on the CBS Television Network.

From the start, Warner's family didn't believe Michelle would just walk off and leave her son behind. They filed a missing persons report. Five days later Houston homicide detectives got the case.

"It was the worst week of my life, Michelle was just gone," says her mother, Donna Malone.

While police searched for clues, Castellano agreed to appear on "The Dr. Phil Show," which is distributed by CBS Television Distribution. Indeed, McGraw was the first to dig deeply into Castellano's story. "There was a woman missing and like everyone else, we wanted to help find her," McGraw tells Smith.

Warner's family had trouble with what Castellano was saying. They didn't much like him to start, and didn't believe his story that Michelle would leave the apartment and abandon her son.

McGraw, having gone face to face with Castellano, also wasn't buying his version of events. "Friends describe her as bubbly - the same people describe you as psychotic," McGraw told Castellano during the taping. "Well, they don't like me too much," Castellano responded. Castellano in a plea to Warner through the cameras, said, "We can fix this."

McGraw tells Smith he had serious doubts about Castellano's story. "My dad used to say for every rat you see, there's 50 you don't. When he tells you that lie, there's 50 more," McGraw says.

All police had to go on, however, was Castellano's story about the night she went off the grid. "We don't have a scene, we don't have a witness, we don't have evidence, we don't have a body," Houston Homicide Detective Fil Waters tells 48 HOURS.

Just two days after speaking with McGraw, Castellano voluntarily went in for an interview with police. What he said next would change everything.

"This is a dance," Waters says. "And I'm letting Mark play the music. And then at one point, another song comes on - and it's mine, and now the dance changes."

Waters' dance change was just one part of the story. It would then take some resourcefulness and an FBI agent with the FaceTime application on an iPhone 500 miles away to locate Warner.

In an interview with Smith, Castellano also reveals he has a deep-seated anger and resentment towards women. "Women are now, you all are replacing men in a lot of aspects," Castellano says. "You all are becoming big-time aggressors. Women are now the new aggressors."

Smith and 48 HOURS investigate the Warner disappearance through interviews with McGraw, Warner's mother, investigators and Mark Castellano. 48 HOURS: "Gone" is produced by Chuck Stevenson, Lucy Scott and Cindy Cesare. Anthony Batson is the senior broadcast producer. Susan Zirinsky is the senior executive producer.

Chat with members of the 48 HOURS team during the broadcast on Twitter and Facebook. Follow 48 HOURS on Instagram.