Following retirement from active play, he has served as head coach of the OHL's Sarnia Sting and Windsor Spitfires.

Letowski won a gold medal with Team Canada at the 1997 World Junior Ice Hockey Championships held in Geneva, Switzerland.

A banner depicting his number 17 in Canadian national team colours hangs at the Progressive Auto Sales Arena in Sarnia, Ontario, where the Sting play.

Midway through the 2001–02 season on December 28, 2001, Letowski was traded by the Coyotes, along with Todd Warriner and Tyler Bouck, to the Vancouver Canucks in exchange for Drake Berehowsky and Denis Pederson.

Letwoski returned to where he began his playing career taking up an assistant coaching role with the Sarnia Sting on April 17, 2010 for the 2010–11 season.