Rapper POORSTACY'S Cause of Death Revealed, But Family Disputing It

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Rapper POORSTACY 's death in Florida was a suicide ... TMZ has learned, but some of his family members feel it was something more nefarious.

Multiple sources with knowledge of the investigation tell us POORSTACY shot himself Saturday morning in a Boca Raton hotel room, but initially survived. He was transported to a local hospital, where he died Monday, after being taken off life support.

Police have yet to officially release the cause of death, but we're told the rapper's family isn't buying it was suicide. One source connected to his family tells TMZ ... the family is disputing it was a self-inflicted gunshot wound ... and they suspect foul play.

We're told POORSTACY had been staying at the hotel for about 10 days, after checking in with a woman and a toddler. Our source says