Update

3:17 PM PT -- Gerry Turner 's disputing Theresa Nist 's version of events a bit ... telling TMZ, "I laughed. That’s preposterous."

Gerry Turner seems to have had an exit plan in case his marriage to Theresa Nist didn't work out ... straight-up telling her where he'd hide her body if he killed her!

Nist exhumed the morbid story during an episode of the "Dear Shandy" podcast ... telling the hosts they were out on a walk near his house along a lake, when Theresa says Gerry pointed out a shed to her. Getty

She then claims Gerry said, "That’s where I’m going to hide your body after I kill you and chop you up" -- a statement Nist swears he deadpanned.

TN's quick to note she doesn't think Gerry really wanted to off her ... however, she does think it may have been Gerry's sub

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