Richard Diamond, Private Detective

David Janssen

Richard Diamond / Chuck Garrett

Richard Devon

Sgt. Alden

Russ Conway

Lt. Pete Kile

Regis Toomey

Lt. Dennis McGough

Bartlett Robinson

Paul Manners

Peter Leeds

Green

Robert Quarry

Arnie Bullock

Peggy Maley

Sally

Patricia Donahue

Mindy Parker

Ross Elliott

Norman Dewitt

Bill Erwin

Sgt. Riker

Michael Fox

Brother Joshua

Richard Reeves

Thug (uncredited)

Herb Vigran

George

Jeanette Nolan

Edna Shaw

William Schallert

Charlie Kane

Nestor Paiva

Axel

Hillary Brooke

Laura Renault

Joe Conley

Joe

Peter Hansen

Frank Bonner

Christopher Dark

Mickey Farmer

Lawrence Dobkin

Joey Kane

Frank Albertson

Stuart Simons

Gordon Jones

Joel Finlay