The incident happened at about 9.50am on Archway Road near the junction of Langdon Park Road.
Two ambulances as well as London's Air Ambulance attended.
A London Ambulance Service spokeswoman said:
“Despite extensive efforts from our staff, sadly a man reported to be in his 40s was pronounced dead at the scene.”
He is the sixth cyclist to be killed in London this year.
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Passengers looked horrified as the girl took the potentially lethal shortcut between platforms.
Police were called to Kilburn High Road at 5.20pm after reports of a shooting.
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