Billy Fletcher's murky past will be revealed tonight as the truth about what really happened to Ellis on that fateful night.
His brother Ellis was brutally stabbed after the infamous Big Night Out, and Billy has clearly been hiding what really happened.
This evening, viewers will find out more about Billy and how he got in trouble with the law.
He will also speak about what happened in prison with Aaron.
Emmerdale's Robert and Aaron cancel surrogacy plans to support Victoria after rape
Ahead of his appearance in Emmerdale, Ellis shared his disapproval for his sibling after he was terrorised by his violent friends years earlier.
Billy and his pals were sent to prison after beating up a man and leaving him for dead, while Jessie always protested his innocence.
When Billy arrived during Marlon and Jessie's wedding in December, Aaron let rip at him.
Speaking to Robert later, Aaron revealed that Billy had made his life in jail 'hell' behind bars.
"Billy, he was evil. Well, they all were," Aaron emotionally told Robert.
When Robert probed him on what exactly Billy did, Aaron said: "There was a gang of them, you know all this anyway."
Robert asked: "Jason's lot?"
Nodding, Aaron continued: "Billy kept himself in the background most of the time. He didn't want to get in trouble, I suppose.
"He was still part of it - he had this way of staying under the radar and he'd never let up. He was clever with it though - he only had to look at you to make you hate yourself. And now he's here."
*Emmerdale airs weekdays at 7pm, with episodes at 8pm on Tuesdays and Thursdays on ITV
