Salaam Alaikum,
 
A Muslim patient is unconscious and not responding. He is not brain-dead and still has brainstem reflexes. He is on continuous renal replacement therapy (CRRT) and mechanical life support. His heart is still beating.
 
The medical team says that the treatment is futile, death is imminent, and there is no hope of recovery or survival. His kidneys are not responding and lungs have ARDS.
 
In this case, is it permissible in Shia Islam to turn off life support and allow natural death to occur?
 
May Allah bless you.