Shazad Khan was found injured in Monks Park at around 6.10pm yesterday (August 19).
The 41-year-old was pronounced dead shortly after.
His family are being supported by specialist officers.
In the early hours of today (August 20), a 26-year-old man was arrested on suspicion of murder.
He remains in custody alongside a 31-year-old woman who was detained at the scene on suspicion of conspiracy to murder.
Detective Chief Superintendent Luke Williams, local policing commander for north-west London, said: “Our thoughts remain with Shazad’s family and friends at this unimaginably difficult time.
“This incident will rightly cause concern across the community, but intelligence at this stage leads us to believe there is no wider threat to the public.
“Detectives are conducting a thorough and fast-paced investigation, and locals can expect to see an uptick in police presence in the area.
“Anyone with any information – particularly dashcam or doorbell footage from the time of the incident – is urged to speak to us as a matter of urgency.”
Those with information are asked to call the Met via 101, or online, quoting 6174/19AUG.
Alternatively, people can contact the independent charity Crimestoppers anonymously on 0800 555 111.
This is a breaking news story. More to follow.
