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The accident happened last week during site preparation works for a new multi-storey car park for Wigan Infirmary.
Greater Manchester Police told the BBC the man died at the scene despite the efforts of emergency services and a joint investigation involving police and the Health and Safety Executive (HSE) has been launched.
A 58-year-old man was arrested on suspicion of gross negligence manslaughter.
The HSE said: “We are aware of the incident and are working with police.”