Johnson has been locked in a bitter war of words with professional golfer Mark Burk since splitting at the beginning of 2009.
The former couple has already filed suits against each other, with Johnson accusing Burk of beating and threatening to kill her, while he countersued for allegedly lying about the claims.
In December (09), the sportsman then sued for $5 million (£3.1 million) in damages in a palimony case - even though the couple never wed - protesting that Johnson reneged on a verbal agreement to financially support him "for the rest of his life".
Burk has now taken further legal action against Johnson, alleging the model took an armed hitman named Chuck Zito to his home in January 2009 to try and scare him into dumping her.
In the legal papers, filed in a Riverside County, California court, Burk claims he was yelled at by his ex to sign an agreement to move out of her house in exchange for a $2,000 (£13,335) pay off, as Zito kept watch with his gun on display.
Burk managed to escape the scary situation by hiding on a neighbour's property until Johnson and Zito left, reports TMZ.com.
But that's not all - Burk is convinced Evans, another of Johnson's former lovers, was also involved in the plot, although further details have yet to be revealed.
Johnson has yet to comment on the latest legal dispute, but Zito has spoken out to insist he was unarmed during the January 2009 visit to Burk's home and was simply there as the model's bodyguard.
He tells TMZ.com, "I was not carrying a gun and don't need to carry one."
This time Burk is suing for emotional distress and unspecified damages.