Mirko ‘Cro Cop’ Announces Decision to Retire

One of mixed martial arts’ greatest heavyweights of all time is calling it a career.

Mirko Filipovic, a former Croatian military police officer that adopted a fitting nickname in “Cro Cop,” announced his decision to retire in a message posted to his official website Tuesday morning.

“Dear friends, unfortunately I had to cancel the fight [against Anthony Hamilton at UFC Fight Night “Henderson vs. Alves”]. In the beginning of the preparation I hurt my shoulder, so I couldn't raise [my] hand. I tried to save a shoulder injury and repair in all possible ways: daily therapy, injections of blood plasma and various cocktails of drugs but it didn't work out. The only cure would be a break of two to…