In the latest episode, at the very end, JD tells Abby that its all about her.
While i do think there is a connection between wakefield and Abby (more on that later), i dont think thats what JD was implying.
Since the beginning, i thought that the killer had to be someone we'd never expect at all. That means he has to be one of the 'nice guys'. And, there are 2 nice guys on the show...Henry and Jimmy. Cal too...but he's not one of the main characters so he cant be it.
Abby came back to the island after years...and in all that time, she had never talked to Jimmy. Now that she's back, they're kinda picking back up where they left off.
Also, Henry has been with Abby the whole time she was away.
My theory: It could be Henry...who has been in love with Abby the whole time and is losing it now coz he's seeing her with Jimmy. That would also explain the look on Henry's face in the final scene of epsiode 8 and why he has blood on his hands...
Now, on to the connection between wakefield and Abby...Abby's mother knew wakefield before she came to the island. And her dad said she had been involved with him etc etc...i think its pretty clear that wakefield is her father.
Im not sure how all these things are going to tie in together in the end...but i think that its just gonna get better from here...