Harish Nainwal, a milk vendor, suffered severe head injuries and died on the way to hospital this morning.
Police were not intimated about the incident either by the family or those who rushed the man to hospital.
"We came to know about the incident through our local sources. We are looking into the matter," said a senior police officer.
The post-mortem was carried out at Sushruta Trauma Centre in Civil Lines and the body was handed over to the family.
Locals alleged that the bull had attacked a youth in the area around three months ago, but the youth had a narrow escape.
Six bulls, including the one which attacked Nainwal, have been rounded up and sent to cattle shelter run by the Delhi government, a North Delhi Municipal Corporation spokesperson said.
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