Plot summary
While under sedation during a dental appointment, Disher thinks he sees the dentist ( Jon Favreau ) and his assistant ( Brooke Langton ) kill an intruder in an argument over Barry Bonds. He quits the SFPD in frustration after the intruder turns up dead and no one takes him seriously, but Monk and Stottlemeyer find evidence linking the man to an armored car robbery and double homicide and start to believe Disher's claim.
Credits
Adapted from Wikipedia contributors, Monk season 4. HTML formatting and reference markers removed.