A London court has given a Nigerian student who killed an academic who had gone out to post cards announcing the birth of his daughter an indefinite hospital order.
Femi Nandap, 23, stabbed Jeroen Ensink, 41, to death in Islington, north London, while in a psychotic rage last December.
He attacked Dr Ensink days after knife charges against him were dropped.
The victim’s widow demanded an inquiry into “mental health homicides” that “keep happening again and again”.
Nandap, whose visa had expired, had admitted manslaughter by diminished responsibility.
Dr Ensink had been leading a project to improve health in Africa through better water quality and sanitation.
Sentencing Nandap at the Old Bailey, Judge Nicholas Hilliard QC described the victim as a “truly remarkable man” adding: “His death is a loss to a large proportion of the world’s poor.”
He added: “I express the hope that those in a position to do so will investigate all aspects of this case.”
Reading her victim impact statement in court, Dr Ensink’s wife Nadja Ensink-Teich demanded an independent investigation into failings by both the mental health service and legal system which led to charges against the killer being dropped six days before the fatal attack.
The court heard Nandap, who came to Britain to take an African studies and economic development course, had been charged in May with possession of a 30-inch knife and assault of a police officer after he punched and bit an officer who was trying to arrest him. The charges were later dropped.
Mrs Ensink-Teich, who was in court with her baby daughter Fleur to see Nandap sentenced, said: “Not only was the love of my life taken from me, but with him also all of our hopes and dreams.
“This is a terrible tragedy for me and for Jeroen’s daughter, and family and friends but it is not a one off; mental health homicides keep happening again and again.
“If such tragedies keep occurring, why has there not been concerted action to address this?
“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.”
The court heard Nandap, of Woolwich, south-east London, was in a cannabis-induced psychotic rage and stabbed Dr Ensink repeatedly in the chest and back until an off duty special constable intervened.
Nandap told psychiatrists he had started to receive telepathic messages and considered himself the “chosen one” or “messiah” in spring last year, prior to the attack on the police officer.
The court order will confine him to a psychiatric hospital after having been found not guilty of a crime by reason of insanity.
He will face deportation back to Nigeria after completing his sentence.