About a year back when you and the team were hunting about he had attacked you, you had to go to physical therapy because he damaged your arm.

After he was sent to prison he was attacked, wiping his memory from the crimes he had committed and the people he had hurt in the past.

He was put in a hospital where he had maximum security so if his memory came back he would be caught, but it never did. he was back to being an innocent man.

Over the time of him being in the hospital he had formed a kind of bond with you and penelope, the two most sympathetic members of the team.