Prodigy, one half of Mobb Deep, has died in Las Vegas ... TMZ has learned.
He's battled health problems for years, most notably suffering from sickle cell, but right now the cause of death is unknown.
Prodigy was in Vegas over the weekend performing with the "Art of Rap" tour ... with Ghostface Killah, Onyx, KRS-One, Ice-T to name a few. Mobb Deep performed Saturday night.
Prodigy and his partner Havoc formed Mobb Deep in NYC in the early 90s. Their biggest hits include "Quiet Storm" and "Shook Ones."
He was 42.