Jonathan Limani, a paranoid schizophrenic described as a 'highly dangerous individual', had been sectioned twice and was being investigated for assault when he was allowed to move to England.
The family of his victim, Chris Varian, yesterday said authorities had made a 'catalogue of errors' in letting Limani move from Sweden to become a waiter at the four-star The Oxfordshire in Thame.
Limani, 34, denied murder but pleaded guilty to manslaughter by reason of diminished responsibility at Oxford Crown Court yesterday.
Limani – who had been working at the hotel for only a fortnight – killed his boss because the 'voice of God' had told him to, a psychiatrist told the court.
Mr Varian, then 32, had gone for a break to the smoking area. Limani took a cheese knife, followed him out and stabbed him before sawing his head off. Alan Blake, prosecuting, said kitchen porter Guy Hathaway-Pearce saw 'the defendant kneeling on the ground holding Mr Varian's neck'. Mr Varian was unconscious and Limani looked 'transfixed'.
The decapitation had taken a 'certain degree of time and energy', according to the post mortem.
Limani pleaded guilty to manslaughter by reason of diminished responsibility, with the prosecution accepting he was suffering from an abnormality of mind at the time of the killing.
Limani had been sectioned twice and diagnosed with psychosis in Sweden and Switzerland. He was taking medication erratically. He served a year in prison in Switzerland for heroin trafficking in 2004. He was under investigation for assault in Sweden – where he claimed asylum – when he moved to Britain.
After his arrest here, he was detained in Broadmoor and diagnosed with paranoid schizophrenia and a personality disorder.
Yesterday, Mr Varian's father Nigel said his son's death was 'macabre' and his family suffered 'daily torture'. He demanded to know why the killer was allowed into the country.