Any kind of information where does it prove that it should not target dead players?
All spells which are used to create this mechanic (https://db.pandawow.me?spell=142416, https://db.pandawow.me?spell=142811, https://db.pandawow.me?spell=142808) have an attribute called SPELL_ATTR2_CAN_TARGET_DEAD which allows them to select dead and alive players.