West Midlands Police say the motive for the attack is unclear. The man has been identified and his family are being informed.
Cockshut Hill and the surrounding area is likely to remain closed until tomorrow.
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A dry and bright day with sunny spells. Rain overnight.
Dry with sunny spells today, then rain overnight.
Chatsworth House is set to reopen following the biggest restoration of the Derbyshire stately home and gardens in almost 200 years.