You joined the BAU in 2000 and in 2005 you died, in a bomb and the team couldn't save you. Then a few weeks later Elle left. And Emily joined.

It had been 3 years since you died. But did you really die? You had to be put into witness protection. And 12 hours ago the person who had ment to be protecting you was shot along with youre 3 neighbours who you had invited over. The team were called over on the case.

They immediately noticed that there was a 5th person and they assumed they had done it. Witnesses had placed a person running out the house with a gun bag and driving off in Frank's car. (The guy who was protecting you but his real name is Chris).

Garcia told the team about this and they were even more confused. They had a sketch artist sit with the witness who saw you getting into the car when the sketch artist showed prentiss, she gave it to Morgan

Morgan: "Hotch" he said as he held the picture in his hand.

Hotch: "Morgan what is it" Morgan just showed him the picture

Morgan: "is it me or does that description look exactly like Guest"

Emily: "who's Guest"

Hotch: "They were on our team 3 years ago, they died"