A FORMER WWE superstar has been shot dead outside his home with police launching an urgent probe.
Kevin Nikel, 41, was best known to fans as NXT brawler Knuckles Madsen as well as Ivan Warsaw on the Indies.

Nikel was reportedly shot and killed on Friday in Benton County, Arkansas.
Cops discovered the professional wrestler with a gunshot wound to his abdomen before rushing him to hospital.
Nikel tragically passed away before he could receive life-saving treatment.
Benton County officials are still investigating the circumstances surrounding the incident.
No arrests have been made in the case yet.
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