ran across intially on twitter feed and did some digging. Apparently the guy collapsed and was rushed to the hospital where it was found he had a huge hematoma (pooling of blood) on his brain. By the sounds of it it was probably an cerebral aneurysm which ruptured, which if true does tend to lead to major permanent neuro damage or death (same thing killed my stepfather in 2008 and his sister in 2012). He's known primary as a high stakes cash player vs tournament player but is well liked among those that know him.