Speaker Knockerz was found dead. The 19-year-old Columbia, SC rapper, Derek McAllister, was found dead in his garage. The cause of death is not known.

The promising musician was found dead in the garage of his home on Thursday according to the Richland County Coroner's Officer, WIS-TV reports.

Some suspect that the rapper was killed while others believe he may have had a heart attack. The cause of death is not yet known but no foul play is suspected. An autopsy was done on Friday morning and the body showed no sign of trauma. The results of the toxicology tests and other studies are still pending. The Richland County Coroners Office and Sheriffs Department are investigating the issue. The report of Speaker Knockerz death was also reported by local newspaper, The State.

According to Elevator Magazine, McAllister's mother, Mesha Wilson, had taken to social media to let her friends that her son was missing since March 4th. "Please say a prayer for my son Derek McAllister ... We are trying to find him. He was last seen 3/4/14 [at 11 p.m.] in a black Camaro 2013,"  she reportedly said "It's not like him not to communicate or come home for this long period of time ... Or show up for a music meeting/session ... I pray that my son is ok."

After his reported death, Wilson apparently wrote "Thank You all SOOOOO much for your outpouring of love and kindness you have shown my family and I during this extremely difficult time."

The rapper last tweeted before his disappearance on March 4th, linking to his new single. "Lonely - Single by Speaker Knockerz https://itun.es/us/ZjarU," he wrote.

Fans of the promising you rapper have taken to Twitter to mourn the loss. Some examples of tweets include:

"R.I.P Speaker Knockerz."

"Another real ... rapper gone too soon, RIP Speaker Knockerz."

"dam man i cant believe this R.I.P. @SpeakerKnockerz i really liked this man music!!!!!!!!!!"

"R.I.P. Derek Mcallister.