Hi, first HH I am posting here... let's go. :)

I played the Irish Open Main Event two weeks ago, so this is a live poker hand.

Blinds are 150/300/(25), I have about 27BB.

It folds to me in MP with Ac4c, I open to 800.

HJ directly to my left calls. He is a middle-aged Italian that had been fairly tight. And I had spotted a tell previously: A textbook tell, really - when the flush hit he very quickly looked away from the board, and indeed, he did have the flush.

BB calls, too (Dermot Blain), He defended a lot)

Flop Ad4dJc

I bet 1,200 in a pot of about 2600

HJ calls (he has about the same stack as me), BB folds

Turn 3c

I bet 3100 in a pot of about 5000

HJ calls

I look at him as I assume he is drawing for a diamond, hoping to pick up the same tell as earlier, but he shields the board from his own eyes and turns towards me. So I have no way of seeing his reaction.

River Kh

I decide to check/call the river, but he checks behind, sees my hand, mucks and says "Bad turn".

What do you think he had? Could I have gotten more value?