Dina Roth, manager of the group, said Monday that Flanigan died Sunday at home of congestive heart failure.

Flanigan along with his cousins Ross Barbour and Don Barbour, and Hal Kratzsch formed the group in 1948 while at Butler University in Indiana.

The group had several Grammy nominations over the years and might be best known for the Capitol recordings “Blue World” in 1952 and “Graduation Day” in 1956.

Roth says Flanigan retired in 1992 but kept a hand in the changing cast of performers. The group now includes Brian Eichenberger, Curtis Calderon, Vince Johnson and Bob Ferreira.