400 NL 9 handed (Boring small hand, just weird)

[Salerosa]

I have been at the table for about 30 minutes, can't think of any hands that would stand out to the rest of the table that I have been in.

EP minraises(450), one caller, I call on CO with AJs(650), Button folds blinds call. Nothing about EP really stands out, as he hasnt done much.

Flop J 4 4 rainbow

EP leads 10, I make it 35, he calls.

Turn 10x

Check, check

River 2x

He checks, I bet 75, he lets his timer run down and calls with AA.

Huh??? Who checks behind on that river?