Well people and many gossip sites are concluding that it was a heart attack, but nothing official was released. 

However, what is known so far is that Atlanta native DJ/Rapper UNK had to be rushed to the hospital because of pains and trouble breathing. People are talking and rumors are flying all over the place claiming that he has been falling victim to that syrup aka lean aka what Lil Wayne keeps sipping on aka what killed Pimp C. 

He is at home now, and recovering. We know this because he updated his Twitter, with a message to everyone. 

"Live healthy, be healthy! Live unhealthy, and suffer the consequences! Keep God first and haters last! Its not over till the fat lady sing"