james koryor , 41 , arrested tuesday on suspicion of manslaughter and child abuse following the death of his son at their home on monday .
the boy , 2 , died after being left in a locked car for up to 2.5 hours .
the outside temperatures hit 93 degrees in phoenix monday .
the mother found her son in the car and tried to resuscitate him .
koryor reportedly confessed to drinking and falling asleep .