Moors Murderer Ian Brady has been taken to hospital after having a seizure.
Brady, 74, was due to appear at a mental health tribunal to argue he should be transferred to a Scottish prison to be allowed to die.
He was taken from his cell in the high-security Ashworth Hospital to Fazakerley Hospital in Merseyside, where he will undergo tests.
A statement from Ashworth said: "Ian Brady has been admitted to a general hospital after becoming acutely physically unwell on the ward.
"He is undergoing a series of tests and as a precaution he will be kept in at least for 24 hours.
"Brady is in a single room and will be accompanied in that room at all times by two nurses from Ashworth Hospital. Two other members of Ashworth Hospital staff will also be on duty outside his room throughout his stay in the general hospital.
"It is too soon to provide a comment about his condition."
Brady, from Glasgow, was jailed in 1966 for murdering three children - Edward Evans, 17, Lesley Ann Downey, 10, and John Kilbride, 12.
Brady and his girlfriend Myra Hindley lured their victims to their death, torturing them before burying their bodies on Saddleworth Moor outside Manchester.
The pair admitted in 1987 to killing Pauline Reade, 16, and Keith Bennett, 12.
Brady has been on successive hunger strikes since 1999 in a bid to take his own life.
Hindley died in jail in November 2002, aged 60.
Brady's solicitor, Richard Nicholas, said the tribunal "was obviously very important".