It was James Morrison aka Bill Buchanan.
It was good to see them still teasing one another. It's well known among T&M fans that Reiko and Carlos became really good friends and still are even though they're off "24".
Reiko (About Carlos):
"He was so great to work with. I got on set and met him and you know, first he starts right in with the teasing. I know when he does the interview, hes going to put on some like 'Oh Reiko, shes a diva, I hated working with her.'" *Giggles*
Carlos (About Reiko):
"Reiko, she has this thing. She blinks a lot. She twitches. Shes got a twitch, a nervous twitch, mainly just when she gets around me."