According to The Mirror, the Albert Square favourite will die in a shock twist in early 2012.
"Heather's life will change dramatically in the new year," a source claimed. "Things seem to be going brilliantly for a while. She has a new man in her life and there is even talk of marriage.
"But things soon take a dramatic turn for the worse and Heather ends up being killed in cold blood.
"Her exit will stun the Square and everyone is looking over their shoulder wondering who is responsible. Even when the killer emerges there will be repercussions for years ahead."
Actress Cheryl Fergison revealed to the newspaper that she would prefer a lighter send-off, saying: "I'd like it to involve George Michael. He could take her on tour.
"She's had four years of struggles so it might be nice," the star added. "I don't mind, though - a big weepy would be interesting. I've had an amazing four years and it has been a privilege to be part of such an institution."
The 47-year-old was axed by producers in September after five years in the role.
> EastEnders Cheryl Fergison: 'I don't know if Heather survives'
Watch Heather's EastEnders character trailer below: