Normally, this only occurs with military combatants. Cohen was only a spy and those rules do not apply. However, I am sure that America will hand over Pollards body when he dies. Being the friend of Israel that it is. Too bad this is not reciprocated.
Jerusalem Gay Pride Parade: Stabber is Yishai Shlissel, the 2005 parade attacker (Haaretz)
from the article: Itzik urges Assad to transfer Eli Cohen's remains to Israel