Forty-two-year-old Scott Harrower died on Wednesday as a result of injuries sustained when he plunged 25 feet through the roof he was working on in Stockport on Tuesday afternoon.
Mr Harrower, of Maddiston, suffered serious injuries to his head and body in the incident at a former retail unit in Manchester Road, Heaton Norris, just after 3.50 p.m.
Earlier that day at 9.15 a.m., a 45-year-old worker, also believed to be from the Falkirk area, fell through the same section of roof.
Both men were taken to Wythenshawe Hospital and Greater Manchester Police confirmed Mr Harrower died on Wednesday, while the older man, who has not been named, remains in a serious but stable condition.
A joint police and Health and Safety Executive (HSE) probe is underway to establish the full circumstances.
The men were working to demolish two empty units on an industrial estate, which is being levelled to make way for a car park. Witnesses at the scene reported colleagues running to help and raising the alarm.
It is understood contractors from Rochdale-based C Smith and Sons were carrying out the demolition.
A spokesman for Greater Manchester Police: “At 9.15 a.m. on Tuesday, police were called following reports a 45-year-old work man had fallen from a roof on Manchester Road, Heaton Norris.
“Officers attended and he was taken to hospital suffering serious injuries. He is currently in a serious but stable condition. At 3.55pm on the same day, police were called back to the same address after a 42-year-old man fell from the roof.
“He sustained serious injuries and was taken to hospital where he sadly died. A joint investigation has now been launched between the police and the Health and Safety Executive to establish what happened.”