Police are appealing for witnesses and information following a fatal stabbing in Pinner.
Officers were called at approximately 06:00hrs on Sunday, 24 March to reports of a man found suffering stab injuries inside a newsagent in Marsh Road, Pinner.
London Ambulance Service also attended the scene but the 54-year-old man was pronounced dead at the scene at 06:46hrs.
The man's next of kin have been informed.
A post-mortem examination will be scheduled in due course.
At this early stage it appears the victim was attacked by a man who carried out a robbery at the shop. It is thought that the victim worked at the newsagent and was opening the shop at the time of the attack.
Detectives from the Homicide and Major Crime Command investigate - Detective Chief Inspector Simon Stancombe said:
"I am appealing to anyone who was in the area around Marsh Road this morning and saw anything of interest to contact police.
"This was a violent robbery that has escalated, resulting in the murder of a man. It appears the till was stolen from the shop during this robbery and this may have been discarded by the suspect. If you have come across this, we want to hear from you.
"I am particularly keen to hear from anyone who saw a black Vauxhall Astra that was driven away at speed, south down Cecil Park immediately after the attack.
"We think that car was parked in Cecil Park prior to the murder - if you saw this, or have any other information that could help us progress this investigation, I would urge you to get in contact."
A crime scene remains in place at Marsh Road. Local officers are in the area and available should residents have concerns or information they wish to pass on.
Anyone with information can also contact the incident room number on 0208 358 0200 on 101 or tweet @MetCC and quote CAD1653/24Mar.
Alternatively, call Crimestoppers anonymously on 0800 555 111.
There have been no arrests; enquiries continue.