Leslie Grantham, 71, played “Dirty” Den Watts in BBC’s EastEnders and is one of the shows most legendary characters.
Having spent the last few years living in Bulgaria, Leslie has now returned to the UK and is in poor health.
According to The Sun, the actor is now being closely monitored by doctors.
It’s reported that Leslie’s close friends within the industry are visiting him as they fear the worst.
A close friend told The Sun: “Leslie is being looked after. Those who are close to him are hugely worried and are praying for his well-being.”
A spokeswoman for Leslie confirmed to the publication: “It’s true that Leslie is very poorly.”
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Leslie moved to Bulgaria from The UK after the breakdown of his marriage after 31 years.
He filmed the soap The English Neighbour in Bulgaria in 2010.
Known as one of EastEnder’s best villains, “Dirty” Den ran the legendary Queen Vic pub alongside his wife Angie.
The couple adopted Sharon, who Den famously referred to as “princess”.
Leslie was killed off in 1989, but was brought back in 2003 when his character appeared to return from the dead.
Two years later he was killed off again, as his three ex-girlfriends teamed up to kill him and bury him under the Queen Vic pub.