Autopsy came back the results are...
Cause of death? Bars

from Tyga (Ft. Fabolous, Jeezy, Meek Mill, T.I. & Wale) – Rack City Remix Lyrics on Rap Genius

Meaning

Fabolous has taken to calling himself “Funeral Fab” lately because he kills other rappers with his verses or “bars”. Also possible but unlikely double entendre referring to death by Xanax overdose. If someone is overdosed on Xanax, he is “racked out”, so it could be an obscure callback to the song title

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