If you've been watching Mare of Easttown on HBO, there's a good chance you look something like this right now:

We're only four episodes in, and it seems like for every answer we get, two new questions pop up.
Mare of Easttown is making me paranoid. Haven’t been so suspicious of an entire group of townsfolk since Broadchurch.
The central mystery revolves around who killed Erin McMenamin, but there's also the unsolved case of Katie Bailey's disappearance. Last week we got HUGE news regarding the latter, and after Episode 5 it seems like the kidnapper is not the same person who killed Erin (but who knows?).
For the sake of theorizing, here are all the people we've been introduced to who could be the killer:
1. Frank Sheehan

The moment Frank asked details about the investigation... my true crime senses started tingling #MareOfEasttown
2. Dylan Hinchey

3. Brianna Del Rasso

Kate Winslet's character not even flinching at the jug of milk crashing through her window & continuing to eat her sandwich is the kind of no f*cks energy I aspire to. #MareOfEasttown
4. Dylan's parents (either one of them)

5. Kenny, Erin's dad

6. Father Dan Hastings

Ok so the murderer on #MareOfEasttown is 100% Kate Winslet's priest cousin becuase: [x] looks like a ferret [x] is a medium-level suspect/character [x] this show is basically a dramatized version of The Keepers already anyway
7. Faye

8. Helen

9. John Ross

10. Erin herself

11. Richard Ryan

Ok Guy Pearce is majorly sus in Mare of Easttown. A new writer who just moved to town who hit on Mare mercilessly, a huge grouch in a button down corduroy shirt. Doesn’t add up memento guy
12. Officer Trammel

13. Deacon Mark

I knew there was something off about those priests #MareOfEasttown
14. The guy who kidnapped Katie and Missy

15. Any combination of two or more characters
16. Some other random person
The following people are technically still suspects, but I think it's highly unlikely that they had anything to do with Erin's death:
This is purely speculative, and I may eat my words later.
17. Mare Sheehan

I can’t believe Mare thought she would get away with that plan against her grandson’s mother. #MareOfEasttown
18. Colin Zabel

19. Lori Ross

20. Siobhan Sheehan

21. Carrie Layden

22. Dawn Bailey

23. Chief Carter
