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Chris McCowen shared his side of the story in a "20/20" interview.
Christa Worthington was found dead in 2002 with a stab wound to her chest.
Worthington worked for Women's Wear Daily, The New York Times and Elle magazine, among other international publications.
Tony Jackett recalls meeting Christa Worthington, who was found murdered in her home on Jan. 6, 2002, and the moment he learned she was pregnant.
"They got the wrong person. This person just would not do that," Don Horton, who was Christopher McCowen's boss at the garbage collection company, said.