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:

PLEASE SOMEONE TELL ME THIS SHIT AINT TRUE ABOUT @PH_TEAMHOMI

— Marco Polo (@marcopolobeats) June 9, 2015

Today is a very shitty day. Just got word my brother Pumpkinhead passed away at 5:40am this morning. My condolences to his family...R.I.P.

— Marco Polo (@marcopolobeats) June 9, 2015

One of the first people to give me a shot when I moved to New York and I'm honored to have recorded "Orange Moon Over Brooklyn" with you.

— Marco Polo (@marcopolobeats) June 9, 2015

Orange Moon Over Brooklyn was the jump off for me really producing more records in the NYC underground. I will forever be thankful to PH.

— Marco Polo (@marcopolobeats) June 9, 2015

Rest In Peace Pumpkinhead. Such a great dude. You'll be missed. Damn

— Evidence. (@Evidence) June 9, 2015

I'm listening to this song @PH_TEAMHOMI sent me a few months backs.. Super dropping jewels. We lost one of the good guys. RiP Pumpkinhead

— OH NO (@ohnothedisrupt) June 9, 2015

Sad news about PumpkinHead... He was a good dude. Rest in peace.

— Statik Selektah (@StatikSelekt) June 9, 2015

R.I.P. Pumpkin Head.

— Dru Ha (@druha) June 9, 2015

Pumpkinhead RIP

— Alchemist (@Alchemist) June 9, 2015

Just heard Pumpkinhead passed away...really good dude...loved some of his music and always loved running into him at events ..RIP bro

— Peter Rosenberg (@Rosenbergradio) June 9, 2015

Sad to hear of #Pumpkinhead passing. Good dude.

— Stretch Armstrong (@StretchArmy) June 9, 2015

aw man rest in peace, pumpkinhead. one of the coolest, kindest people to walk this earth.

— el-p (@therealelp) June 9, 2015

Pumpkinhead RIP. Good brother, dope MC, OG in NYC's indie rap circuit. Used to always quote his old demos to him and bug out. Salute.

— J-Zone (@jzonedonttweet) June 9, 2015

RIP Pumpkinhead/PH. Had love for dude. From our days @ rap battles to working @ Delias. He showed love when no one else did. Great guy + MC

— Rob Markman (@RobMarkman) June 9, 2015

I'm completely devastated. RIP PH. pic.twitter.com/wDmsRaHk20

— PHAROAHE MONCH (@pharoahemonch) June 9, 2015