While there is no concrete information on the cause, reports on social media say that Robert Alan Diaz, the Brooklyn-based MC known as Pumpkinhead (or PH) reportedly passed away this morning. 

Pumpkinhead's name has been in underground circles since the late '90s, with a remix of his 1997 single "Dynamic" getting placement on The World Famous Beat Junkies, Vol. 2. He was probably best known for standout features on projects from Immortal Technique and Jean Grae, although he not only made a name for himself on his Marco Polo-produced 2005 album Orange Moon Over Brooklyn (Soulspazm/Rawkus), but was also a part of the legendary Brooklyn Academy.

Pumpkinhead also made an impact in the world of battle rap, being affiliated with GrindTime New York, winning a pair of Braggin Rites championships, a pair of End of the Weak challenges, and even being featured in a storied battle against Breez Evahflowin at the 1998 Blaze Battle. Pumpkinhead took his talents across America as well as touring in Japan, Australia, Sweden, and Amsterdam, and opening for the likes of the Boot Camp Click, the Goo Goo Dolls, and rocking stages with many others.

Pumpkinhead was 39. Billboard reports that Pumpkinhead is survived by a wife and two sons, with a baby girl on the way.

Many of his peers are sending their condolences via social media: