1) American country music group 2) Colombo portrayer 3) Columbo 4) Columbo player 5) Columbo portrayer 6) Columbo star 7) Conrad novel 8) Jewish boy name 9) Lieutenant columbo portrayer 10) Peter who played Columbo 11) Peter, the actor 12) Sibling musical duo 13) The Cheap Detective star Found on https://www.crosswordclues.com/clue/falk