Brennan told him everything. All about the bomb in the fridge and the note, and the hair in his car and how it matched Kenton's old control sample.
"But he's in prison…" Booth shook his head. Still grasping Parkers hat.
"That's what I thought too so I made some calls… using you name "she added quickly. "And it turns out that he was released about three weeks ago!" she said. He began pacing.
"What! Bu his sentence was for…" he was interrupted.
"I know! But seemingly he still has friends on the outside." She sighed in frustration.
"Great. So he almost kills you, twice. After killing Cugini, oh and taking Hollings out on the way. And now he is free and picking off our friends one by one! And he has Parker!"
"What did the note say?" she said.
"I have him. He's alive." Was all Booth said.
"I'll go talk to Cullen. To get some answers." She went to the door. "Booth now that we know who it is we will be able to catch him!" Booth didn't reply he just looked at the hat.