Joint venture off after three months.

Damon Dash and Island Def Jam are calling off their joint venture for the Damon Dash Music Group just three months into the deal, sources familiar with the situation confirm. Word of an official split could come as soon as later this week.

Dash -- the former CEO of Roc-A-Fella Records, the label he launched with Jay-Z and Kareem "Biggs" Burke -- inked a two-year deal with Island Def Jam for his new imprint/music marketing operation in January. The deal came after IDJ took control of the remaining 50% of Roc-A-Fella that it didn't already own, and named Jay-Z president/CEO of Def Jam Recordings.

DDMG provided marketing services for Beanie Sigel's "The B. Coming" (Roc-A-Fella/Def Jam). That album debuted with sales of 131,000 copies the week of April 6, according to Nielsen SoundScan.

Another Dash project, Ol' Dirty Bastard's posthumous album, "A Son Unique" -- originally due in May -- is not expected to be released through IDJ, sources say. Dash is expected to shop the project elsewhere.