A former mixed martial arts (MMA) fighter from Philadelphia has found himself at the center of a tragic and violent crime. Andrew Osborne, a one-time professional MMA competitor, has pleaded guilty to the first-degree aggravated manslaughter of 47-year-old Brian Wilkinson in a hotel room at the Ocean Casino Resort in Atlantic City, New Jersey. The incident occurred on September 23, 2022. Andrew Osborne, now 35, was once a promising MMA fighter, competing professionally between January 2012 and October 2013. During this brief stint, he fought in three bouts for three separate promotions, amassi…