19 year old Columbia South Carolina rapper Derrick McAllister, known as  Speaker knockerz has passed away. Local WIS-TV has reported “no foul play suspected in Columbia rapper’s death,”. McAllister was found dead inside his home Thursday morning (previously reported he was found in his car). Early reports from social media outlets including twitter speculated as to a possible heart attack but is yet to be scene  as coroners office await toxicology reports. McAllister had been reportedly missing the past few days which caused his Mother to reach out to find information regarding his whereabouts. Very sad news for a young artist with a bright future. RIP.