As far as I know, xman, Tutankhamen did not have his heart removed. To the Egyptians, the heart had to be with the deceased. It was placed on the balance scale with the feather of Ma'at, and had to be pure to admit the deceased into the afterlife. Where did you get your information that the heart was missing?
The report on the scan mentions the missing rib-cage and sternum, but think that it was probably done by Carter and his team while inspecting the mummy, and obtaining any jewelry or amulets in the (hardened) wrappings. You can read the report here:
http://www.guardians.net/hawass/press_r ... esults.htm