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CrossFit co-founder Lauren Jenai plans to marry accused murderer Franklin Tyrone Tucker while he’s in a Florida jail — and the multimillionaire fitness guru told us she’s not even making him sign a prenup.

We previously reported that Jenai — the ex-wife and former business partner of CrossFit mastermind Greg Glassman — struck up a relationship with high school classmate Tucker on Facebook, but he was then arrested on first-degree murder charges with two other men in a Florida Keys case known as the “Tree House Murder.”

In the bizarre crime, a man who came to the aid of a neighbor being robbed at knifepoint was stabbed to death.

Tucker maintains his innocence.

Jenai — who reportedly sold her CrossFit shares for up to $20 million as part of her messy split from Glassman in 2013 — had told us how she fell for Tucker during their video chats.

“We hadn’t seen each other in 30 years . . . We started having feelings for each other . . . We’re going to get married,” she said.

She’s been fighting for Tucker’s freedom and the two planned to wed when he got out on bond.

But his bail was denied at a Jan. 29 hearing.

Jenai now says they’ll tie the knot at the detention center where he’s been locked up since 2017.

She told us, “We would be allowed to have a wedding in jail . . . [we] would get to be together for the first time in the same room” during their courtship.

She’s hoping the nuptials will be this summer, in part so she can begin to medically advocate for Tucker, who she said suffers from two hernias.

She added she won’t have Tucker sign a prenup: “Our relationship is very open and we are a team. I trust him. I love him. My house is his house. A prenup feels a little inappropriate.”

However, there’s even more pressure for them to be together because Jenai’s been barred from video visitation with Tucker for a whopping 100 years, after an incident in February.

“I got a little risqué . . . I was touching my boobs,” she admitted.