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.
More top news
West Midlands Weather: Dry with clear spells overnight, but some rain later tomorrow.
East Midlands Weather: Largely dry and sunny initially, becoming unsettled later this week
Midlands Pollen Report