After nearly 13 years as a professional fighter, Seth Petruzelli will step away from the cage. The 33-year-old Petruzelli (14-8 MMA, 1-2 BFC) made the announcement Friday morning on his Facebook page. His announcement comes following a knockout loss to Muhammed Lawal on Wednesday night at Bellator 96. “The Silverback” goes out on a two-fight skid, with both losses coming in the first round as part of Bellator’s most recent two light heavyweight tournaments. Petruzelli, in his online statement, said has has lost some of the drive to fight the way he used to