UPDATED: A 25-year old man died on Wednesday after being injured at the Brook House building site in London, where demolition firm Prodem was carrying out work on behalf of Galliford Try.
The Metropolitan Police said they were alerted at 3.49pm on Monday.
The man suffered multiple injuries, and was taken in a critical condition to Royal London Hospital by the ambulance service.
He died on Wednesday 31 October. A post-mortem is being conducted today.
A Prodem spokesperson said it was a very sad time and a tragedy, and offered their condolences to the family.
It is the second death on a London building site this week, after a worker died and two people were injured on a site in Putney on Monday.
The Brook House site was formerly the site of a the Cannon Rubber factory, which was closed after a worker was killed in an incident involving a forklift in 2008.
The Health and Safety Executive said it had been on site and was investigating, but that the police had primacy at this time.
Galliford Try issued this statement:
Galliford Try can confirm that an employee of a subcontractor has died following an accident at the Brook House site in Tottenham on Monday.
Our thoughts are with his family at this time.
The HSE has begun an inquiry into the accident with our full co-operation and support.