The killer of renowned academic and new father Dr Jeroen Ensink has been stripped of his right to live in the UK and is likely to be deported if he is ever deemed fit for release, a court heard.

Dr Ensink, 41, was stabbed to death by Nigerian student Femi Nandap, who lived in Woolwich, as he left his flat in Islington, north London, in December last year.

He had gone out to post cards announcing the birth of his 10-day-old daughter Fleur.

Nandap, 23,  was suffering from a cannabis-induced psychosis at the time of the killing.

Earlier this year, he admitted manslaughter by diminished responsibility and was handed a hospital order with no time limit by an Old Bailey judge.

Judge Nicholas Hilliard, QC, held a further hearing to discuss whether to make a further deportation order in the event Nandap is ever safe to release from Broadmoor high security hospital.

He outlined the issues and said the Home Office had confirmed that Nandap's continued leave to remain in Britain had been "cancelled" and now he has "not got any right to remain in the UK".

He said: "In these circumstances, if the time came, if he were close to being released, Broadmoor hospital would inform the Home Office immigration enforcement section and they would consider whether he should be deported.

"In those circumstances, the Crown are not asking me to make an order. I can see the reason why and I am not proposing to make one. It seems to me it would be covered in other ways."

Earlier, the court had heard how Nandap came to Britain to study African studies and economic development on a student visa.

In Spring last year, he became psychotic from smoking cannabis and believed voices telling him he was a "Messiah".

In May 2015, he was arrested for wielding a knife in public and punching and biting a police officer. While on conditional bail, Nandap went home to Nigeria where he was treated for mental illness.

His sister informed British police about his condition in August and handed in a certificate saying he was unfit to travel.

On his return in October, Nandap had stopped taking anti-psychotic drugs. Then just six days before the killing, charges against him were dropped at magistrates court in December.

The prosecution admitted the decision to drop charges against Nandap of having a knife and assaulting a police officer was wrong.

Dr Ensink's widow Nadja has demanded an inquiry into how Nandap was free to carry out the killing.

She said in October: "If a person with a history of mental health problems is found wandering about with a knife, and attacks a police officer, then that person must be referred to a secure unit for proper assessment and treatment and not given bail so easily.

"This represents a failure of the health and judicial system that should protect the public and care for those with severe mental illness."

Dr Ensink, originally from Holland, worked at the London School of Hygiene and Tropical Medicine.

He was a renowned water engineer and a dedicated humanitarian who was committed to improving access to water and sanitation in deprived countries.