Just rewatching the documentary now.
These brehs were both named, but JMJ's fam alluded that it was Big D, not Little D. But it was Washington who said he saw Big D and Little D leaving the studio
Big D is Lil D's pops, he must have know what was happening and I believe that the drug deal story about "Unc" in the mid-west was true. Apparently Big D and JMJ owed a drug dealer $180k over a bad drug deal, and Big D was looking at payback (don't know what killing him would achieve). But it seems as if maybe Big D got his son to do the hit with Washington
Edit*: Detective Derrick Parker who is a retired NYPD officer pretty much solved the case lol. He said it was Lil D. Lidya the receptionist said Washington held the gun to her head.
This was solved already years ago. NYPD botched this up, no wonder FBI took over the case.
Someone thankfully talked.
RIP Jason