The sinister storyline is thought to begin when Colin returns from Canada unexpectedly, throwing John's world into chaos because he has stolen his old acquaintance's identity to continue working as a teacher following his stint in jail.
According to the Daily Star, Colin ends up dead after clashing with John, prompting the ex-convict to hide his corpse in Underworld, where renovation work is being carried out in the aftermath of Tony Gordon's siege explosion.
Builders working at the factory go on to pour concrete over the spot where Colin is buried, leaving John - played by 36-year-old Graeme Hawley - to think he is in the clear.
However, John's friend Charlotte Hoyle (Becky Hindley) is also involved in Colin's death and panics over the situation, claiming that the truth is "bound to come out".
Meanwhile, another possible stumbling block for the teacher comes when factory boss Carla Connor (Alison King) spots him on the building site shortly after the concrete is spread.
The storyline is expected to unfold later this year.