Career
He was drafted by the Philadelphia Flyers in 1981 National Hockey League Entry Draft, but traded to the Toronto Maple Leafs in 1982 for Darryl Sittler. Costello was born in Framingham, Massachusetts, but grew up in Natick, Massachusetts. Costello spent part of the 1983-1984 season with the United States National Team.
He spent the following three years in the Leafs organisation, in which he played a total of 12 games in the National Hockey League, but spent most of his time in the American Hockey League.
He later played professionally in Finland, Germany and Switzerland.