The cause of Betts' death Saturday was not known, the Washington Post reported Wednesday.
He also played in bands with Oscar Peterson, Tommy Flanagan, Woody Herman, Nat Adderley, Joe Pass, Clifford Brown and Vince Guaraldi.
The native of Port Chester, N.Y., got his nickname as an infant when a family friend said he was as cute as a mosquito and it became shortened to Skeeter then Keter, the Post said.
Survivors include five children and four grandchildren.
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