His sister, Roxy Hall, wrote on Facebook that the 47-year-old died on August 2.
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"I will value my time with him the last six weeks of his life that I spent at his bedside in the hospital and then finally hospice. I was able to love on my baby brother, and I will always cherish the memories of having an honor and privilege to do just that!" Hall wrote.
Playbill's website says Oliver took the Broadway stage as an understudy for "Fiyero" in "Wicked", "Benny" in "In the Heights" alongside Jordin Sparks, and as "Simba" in "The Lion King."
His cause of death has not been revealed.
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Playbill says Oliver is survived by his partner, Richard, his sister, and his two brothers.
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