Andrew Scarborough reveals Graham Foster is "on the brink" after Joe Tate's disappearance.
The 'Emmerdale' actor has opened up on how the former soldier is coping after the apparent death of Ned Porteous' character, and how the guilt is consuming him after driving him to drink.
He told RadioTimes.com: "Graham is distraught and bereft without Joe, he misses him terribly.
"He's very lonely and is drinking too much... Graham is on the brink of exploding and wants to tell Debbie everything, but he doesn't. He's drinking and finding it increasingly difficult to keep a lid on it, but knows he must.
"What he does say is that Debbie's dad Cain knows more than she realises. It's Graham's way of deflecting and transferring - he wants someone else to feel what he's feeling."
Cain - played by Jeff Hordley - believes he is responsible for killing Joe, who he punched to the ground for jilting daughter Debbie (Charley Webb) at the alter.
However, viewers discovered he was still alive after hitting his head on a rock, when Graham - who was told to kill him by employer and ex-lover Kim Tate (Claire King) - put him into his car boot to dispose of the body.
It's not been revealed whether he actually finished the job or let him run free, and Andrew has admitted he'd love Joe to make a shock return to Home Farm.
He added: "That would be wonderful! Graham treated Joe like his own son, and I don't think Graham would be able to kill him..."
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