Possible Clues:

• Jon of 'Chicago P.D.'
• Jon of "Chicago P.D."
• Actor Jon of 'Chicago P.D.' and 'Chicago Justice'
• "Homicide: Life on the Street" actor Jon
• Jon of TV's 'Homicide'
• Actor Jon of "Homicide"
• Actor Jon of 'Homicide'
• Jon of HBO's 'Treme'
• Jon of TV's 'UC: Undercover'