Possible Clues:

• Sitcom pal of Kate
• Holden's late brother in 'The Catcher in the Rye'
• 'Solutions and Other Problems' writer Brosh
• Brosh who wrote 'Hyperbole and a Half'
• Actress Grant of 'Weeds'
• "Kate and —" (old sitcom)
• Basketball reporter LaForce
• Nickname that sounds like a passageway
• '80s TV's "Kate & ___"
• 'Kate & ___' (1980s TV show)