Lou Costello died on March 3, 1959 at the age of 52.
Patty Costello died in 2009.
Walter Costello died in 1917.
Eileen Costello died in 1962.
Declan Costello died in 2011.
Seamus Costello died in 1977.
Les Costello died in 2002.
Larry Costello died on 2001-12-13.
Dan Costello died on 1936-03-26.
Jill Costello died on 2010-06-24.
Louisa Stuart Costello died in 1877.
Frederick H. Costello died in 1921.
Maurice Costello died on 1950-10-29.