
As the brothers later discussed, the thinking was that John had a family and Billy had no one, so if somebody was to take the fall, it should be Billy and not John. The killer was - seemingly - unmasked five minutes into the episode. When you saw Billy telling John he killed Erin, what you actually were seeing was Billy committing to the lie they had agreed on to protect Ryan.
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It was actually the young Ryan Ross ( Cameron Mann), John's son, who shot Erin on accident while trying to prevent his family from breaking up again. Mare of Easttown ‘s finale check out our full recap here revealed that the killer was actually John and Lori’s son Ryan, who was angry about his dad’s cheating ways and tried to scare Erin. He didn’t realize that it had been returned until later, which isn’t a plot hole. Glenn checked and noticed that the gun was missing.

It was also not, as everyone thought at the beginning of this episode, Erin's cousin John Ross ( Joe Tippett), though he was the real father of Erin's baby. Mare of Easttown finale: Glen explains how he knew the gun was missing, there is no plot hole Then later, he heard a noise out in the shed, which was likely Ryan going to steal the gun.

It was not, as everyone thought at the end of the last episode, Erin's cousin Billy Ross ( Robbie Tann). Mare of Easttown concluded on Sunday by explaining who actually killed Erin McMenamin ( Cailee Spaeny) and how, and then explaining it all over again.

Mare lost Kevin, but she’s always loved Drew Lori lost Ryan, but maybe she’ll one day love DJ. What a freakin' mess that has been made in Easttown. Moira opens the door to Mare, and Lori accepts the hug that is offered.
