User blog:General MGD 109/Do they need Death to die?

I'm curious, Death was imprisoned for thousands of years, and people continued to die, suggesting, his physical presence isn't required for people to die, or his Reapers can stand in for him, when he isn't around, but in "Appointment in Samarah", It implies that Death is required for people to die, other wise they would just survive, does any one have an idea how exactly this works?