Kenzie was one of the worst unsubs the BAU had even seen she was a master mind criminal and for a long time they couldn't catch her. She was in prison till she got moved to psych ward. Hotch hated that they had a copy cat killer and they were following her MO down to the last detail cause no one knew her better than herself Hotch decided to bring her in to help them. Hotch hadn't told the team. She was the reason why Gideon left the BAU she drove him to almost insanity with her mind games. Hotch gathered the team in the bull pen. Reid, Prentiss, Morgan, Rossi, and Garcia. Hotch knew she was on the elevator up with a guard. Hotch: Listen up to help us I decided to bring someone in Prentiss and Garcia looked at each other confused Spencer: Who could help us with this? he asked confused everyone thought she eas still in a max security prison in some dark hole rotting for her crime. The elevator dinged and she got off.