[nextstep]

Plenty of albums have been released under Tupac's name since he died. Some of the work (the production, the lyrics, obviously the vocals) was material that Tupac had worked on but never released.

According to wikipedia, Suge Knight produced most of these posthumous albums[1]. I assume the royalty split was probably the usual percentages going to the label and distribution, and a much smaller fraction going to Tupac (or his estate in this case). So, all in all, probably no worse of a deal than most living artists can expect from major label contracts.

[1] http://en.wikipedia.org/wiki/Tupac_Shakur_discography