It was revealed within the first few minutes of the show that Polly Gray was killed by the IRA in retaliation to Tommy Shelby's plotting against them.
Tommy discovered that his aunt had died after three body bags were returned to him. It was revealed that Barney, Aberama Gold, and Polly Gray had been the victims when the scene cut to Aunt Polly's funeral.
Polly's son Michael Gray then resolved to get revenge on his cousin Tommy who he blamed for his mother's death.
#Pollygray #Peakyblinders #Thomasshelby #Tommyshelby #Pollydeath #AuntPolly