Heather Costas is a character in DEXTER. Heather was a prostitute and is one of ten women who were named on the buckets of the Ice Truck Killer, making her one of fifteen known victims to the killer. Her name is revealed in Born Free, alongside the buckets for Tammy Goode, Jill Vartos, Guilda Ruppert, Teri Ludlow, Alice Curry, Amy True, and Terry Foster. There are two unknown buckets, as well as a fourth bucket with blood still present (likely representing Monique). One of the two unknown buckets is Sheri Taylor, the third unfortunate victim shown in the show at the Ice Rink during Popping Cherry.
When Heather was killed and whether or not she is one of the other girls shown dead in the show is uncertain.