Barry Tilly

&nbsp Agent Barry Tilly''' is a human male FBI agent working in Chicago. He first shows up in Changes when Harry is brought in for questioning about the explosion of his building.'''

It is speculated that Tilly will be the new source of Dresden's case work.

Biography
Sometime in the past Agent Tilly and Karrin Murphy met they also seems to hold each other in enough regard that when Tilly says that Karrin backed Dresden he was impressed and by proxy had respect for Harry.

Harry of course meets Agent Tilly when he is fingered by Rudolph as the prime subject when his own the building that used to hold his office is destroyed. Tilly does not believe that Dresden did blew up his building. Rudolph lied his ass off to Tilly's superiors to get Dresden here. Even though Tilly told Harry he could call him Tilly, Agent or Agent Tilly, Harry ignores all the options available and nicknames him Slim. Harry seems to genuinely like Tilly and when they shake hands Tilly's hand tingles indicating a minor talent. Harry believes that his ability probably augments his ability to tell when people are lying and help him be a great detective. As Harry is leaving and Tilly asks for who really blew up the building he honestly processes the information given to him.

During the attack on the FBI building by the Reds Karrin calls out to Tilly shouting Barry which grabs his attention and Tilly automatically goes cool under the pressure. Tilly seems to be adapting to the addition of supernatural in his world rather well and may return to the series in the future possibly to be Dresden's new source of work.