A man has been detained indefinitely under the Mental health Act after he stabbed and killed a dad of three in Fulham in an apparent unprovoked knife attack.

Frederic Andre Russell, 30, pleaded guilty to manslaughter due to diminished responsibility at the Old Bailey on May 4.

He killed Colin Hammond in Fulham High Street with a single knife wound on October 25 2012.

Police were called to the scene shortly before 7pm to reports of an assault, but the 65-year-old was pronounced dead at the scene.

The defendant was still carrying the bloody knife when he was arrested near historic Hammersmith Bridge around an hour later.

He attempted to harm himself but was stopped from inflicting serious injuries by a quick-thinking police officer.

He was arrested on suspicion of murder and taken to Hammersmith police station. He was later sectioned under the Mental Heath Act and taken to a west London hospital.

A postmortem confirmed Mr Hammond, who was originally from Scotland but was living in Fulham, had died from a single knife wound.

Not clear what triggered violent attack

Police say the two men were not known to each other.

Detective Chief Inspector Jamie Piscopo of the Homicide and Major Crime Command said: “It is still not clear what triggered Russell’s attack on Colin Hammond.

"What is clear is that this was a violent attack carried out by Russell in broad daylight which resulted in the death of an innocent man.”

Russell was sentenced to a hospital order under section 37 of the Mental Health Act and also given a restriction order under section 41 of the same act. There is no time limit for each order.

In April a mum was detained under the Mental Health Act after she killed her two month old baby. Federica Boscolo-Gnolo dumped the Farah's body in a bin. It was never recovered.