The 52-year-old actor was the only original 1984 cast member left on the show.
Stewart cut his wrists in his dressing room at the south London studios where the show is filmed but then telephoned for help. Security staff found him and called an ambulance.
Stewart was suspended for a week from the show shortly before Christmas following a furious on-set outburst but later dismissed.
An unnamed source linked to the program said Stewart’s suicide bid had been “a desperate cry for help”.
“It’s extremely sad,” the source said. “He is in hospital and is being cared for.”
Source: Yahoo / AAP