Logan (Corbin Fisher) -- beaten around October of 2007 and eventually died in December 2016 after spending nearly a decade in a vegetative state. All 6 of his attackers were convicted, though I don't know if they are still serving. Greatly beloved mostly bottom from the early days of the site.
Axe (Amateur Straight Guys) -- Paralyzed from the waist down in a motorcycle accident -- also in the fall of 2007. He did about 37 videos for the site and was one of their most prolific and well-known models and a mostly bottom. I don't know the exact cause of death, but it has been stated that people who become paraplegics and such end up not living long lives for various reasons (possibly due to not being able to exercise much of their body -- and possibly losing the will to live). To that extent, Bo Dean might also get lumped into this category.
Crow (Amateur Straight Guys) -- Probably the site's most well-known exclusive bottom. According to founder and previous site owner Doug Delong, Crow was murdered by his girlfriend after finding out about his work for the site. I haven't been able to find any conclusive evidence of this (and Doug isn't exactly the most honest individual ever), but I wanna say various people have said this over the years. I hope to find proof of this someday if it happened.
Nash (Corbin Fisher) aka Kyle Dean (GayHoopla) -- undetermined. He won bodybuidling championships in his pre-modeling days and was said to be a good brother to his special needs younger brother.
Ty Thomas (Next Door Studios) -- undetermined. Was studying to be a nurse in Los Angeles. He died in may and his parents were absolutely devastated. A GoFundMe page was set up to cover costs of transporting his body from California to Arkansas and it nearly met its goal.
There were a few other CF models that died, including one of the Seans (the one that was active around 2011-2012) and one of the Austins (from the site's real early days -- who later worked for CNN), though I never followed their work closely and I don't know if it was ever revealed what they died from.