On Sunday, doctors at KEM Hospital said Shanbaug was shifted to the MICU after she developed pneumonia.
“She is on oxygen support but is stable,” said a senior doctor on condition of anonymity.
Walmiki had choked her with a dog chain, before sexually assaulting her. Due to asphyxiation, Shanbaug suffered brain damage.
Walmiki was caught and convicted of attempted murder and robbery, but not of rape.
In 2011, author Pinky Virani had approached the Supreme Court seeking permission for administering euthanasia (mercy killing) to Shanbaug, but the court turned down the petition.
None of Shanbaug’s family members visits the now 65-year-old, though the hospital nurses continue caring for her and celebrate her birthday every year, said hospital officials.