The man collapsed in Kettering Road, opposite Henry Street, just before 6pm on Monday, June 21.
A spokesperson for the East Midlands Ambulance Service said: "We received a call at 5.52pm on 21 June to Kettering Road in Northampton.
"The caller reported that there was a medical emergency. We sent three paramedics in ambulance cars, a crewed ambulance and the air ambulance.”
Northamptonshire Police told this newspaper that there were a "large number of people present", therefore, police assistance was required.
A police spokeswoman added: "Sadly, despite the best efforts of passersby and then paramedics, he could not be revived."
The cause of death has not yet been confirmed.