Is bee sting can killed my fiancee?

Question

he just got it from bee sting on his arm.

Answer 1

if he is allergic it can

Answer 2

If he's extremely allergic to bee stings, then yes, it could kill him, but I don't know how allergic he is. Take him to a doctor.  

Answer 3

unless he is allergic to bees

Answer 4

My mother almost died from a yellow jacket sting. Found out she was allergic.