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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Cold, with some wintry showers at first, but with any snow becoming confined to the hills.
A few remaining scattered snow showers during the evening, with clear, dry periods in between.
A roadside recovery worker who was hit by a lorry as he was working on a vehicle on the M6 says he is lucky to be alive.