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Floyd Roger Myers Jr . -- a former child actor best known for his role in the "Fresh Prince of Bel-Air" -- has died ... TMZ has learned.

His mom, Renee Trice tells TMZ … Myers passed away in the wee hours of Wednesday morning from a heart attack at his home in Maryland. She tells us he suffered 3 prior heart attacks over the course of the last three years. She says she just spoke to her son last night.

Floyd kicked off his career as a younger version of Will Smith in the hit sitcom "The Fresh Prince of Bel-Air" ... before taking on the role as a young Marlon Jackson in the television miniseries "The Jacksons: An American Dream."

Myers had bit part in one episode of the short-lived TV drama "Young Americans" in 2000.

Floyd was 42.

RIP

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