Cooliowasbusy working up until he died, but there was one opportunity he was super excited about that unfortunately never happened ... he was supposed to appear on one of Nick Cannon's most popular shows.
Sources familiar with the situation tell TMZ Coolio was scheduled to be in Atlanta to film an episode of "Wild 'N Out" on Tuesday, Sept. 20 ... but the rapper was forced to cancel at the last minute.
We're told Coolio really wanted to be on the show, and producers had been working for a long time to make it happen before they were finally able to find a date that worked.
We're told Coolio was a huge fan of the show and was bummed he couldn't participate. What's more, Valentina Nicolette, who booked Coolio for the gig tells us he was also planning to perform "Gangsta's Paradise" during his time on the show.
As we first told you ... Coolio appeared happy and in good health later that same week, taking pics with fans in a Texas airport ahead of a concert in the Houston area with Vanilla Ice.
Coolio, who lives in Las Vegas, was in Los Angeles the last week of September to fix a passport issue so he could travel to Germany for some upcoming gigs ... but he died while visiting a friend's house.