Negan Smith was the leader of the saviors until the big fight happened and Rick slit his throat. Negan had to sit in a prison cell for 6 years and he was missing from his cell one day.

You were on whisperer territory because you were doing a job for Carol, spying on Alpha. You stumbed across the whisperer camp and saw a familiar leather jacket. It was Negan, swinging barbed wire bat around wearing a skin. He noticed you and slowly approached.

"You should get the hell out of here kid." Negan spoke quietly, like he was trying to be discreet that he was talking to you.