Steve Wagner is a character in Mr. Monk and the Astronaut. He is an astronaut who killed his former lover Joanne Raphelson after she was about to publish a tell-all autobiography, which including the detail of him, physically abusing her in the past. Fearing the truth would hurt his career and reputation, he drugged her, then used a garage door system and mailed a taped-down remote hidden in a doll to hang her while she was unconscious and he was in space. The plan worked, and Raphelson died. Wagner also spoke at Julie Teeger's school's career day, as did Adrian Monk.
But Wagner's plan had a major problem. Someone had taken the doll from Raphelson's doorstep. When Wagner saw Darrell Cain's daughter Donna with the doll (which Darrell had stolen), he invited the Cains, Adrian Monk, and Natalie Teeger to watch him take off as part of a test flight. At the air force base, he stole Donna's doll, intending to dispose of it during the flight, but he was stopped by Monk, who stood in front of the plane. Wagner was subsequently arrested.
The story of Raphelson's murder and Wagner's arrest was going to be made into a movie in Mr. Monk and the Actor, but it was cancelled.