“Once you turn that invisible line, there’s no going back,” said UFC legend Mark Kerr, speaking to Sports Illustrated about his addiction. Fans knew him as ‘The Smashing Machine.’ Kerr captured two UFC heavyweight titles after debuting in the promotion in 1997. At his peak, he dominated opponents and looked unstoppable inside the Octagon. However, away from the spotlight, his life veered into a darker fight. Kerr battled prescription painkillers and ...