Subject: Why does a person die when his blood temp. falls below a certain value?

I’ve been told that if a person’s blood goes below a certain temperature 
(which by the way, is well above the freezing point of blood), he will 
die. Though I don’t know exactly what that temperature is, I would like to 
know what exactly happens (i.e. physiological changes in the body) that 
results in the person dying. 
Thank you 

Re: Why does a person die when his blood temp. falls below a certain value?