William "O'Neil" Spencer (November 25, 1909 – July 24, 1944) was a jazz drummer and singer.
He is most known for his work in the John Kirby Sextet.
He joined Kirby's group in 1937, but had to leave for a time in 1941 due to tuberculosis.
He rejoined in 1942 staying until 1943, but died soon after from the disease.
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