MIAMI –– The grieving family of a “loving” Florida dad allegedly murdered by con artist who spent a month on the lam hopes the accused killer rots in jail for the rest of her life.

“Dangerous” fugitive Isabelle Rose Johnson, 38, was busted Thursday in Cottondale, North Florida, on suspicion of killing Jason Coulthart, 43, with a zip tie and burying him in a shallow grave.

Johnson was sporting a black T-shirt saying “FORCE TO BE RECKONED WITH” when she was found by deputies and had used several aliases and a web of accomplices to evade police since going on the run on June 25, cops said.

“Let her rot in jail,” the victim’s brother, Timmy Coulthart, 41, exclusively told The Post from New Jersey.

“I’m happy she’s caught. I just want her to answer a certain amount of questions and rot in jail for the rest of her life. That’s all I want.”

Asked to describe his brother, Timmy said Coulthart was “loving, caring and helped anyone who needed help.”

Johnson was detained about 60 miles northeast of the Freeport property where cops found Coulthart’s remains.

The dad of a 20-year-old son, who according to his brother worked as an electrician, was first reported missing on May 24 but his body was not discovered until a month later.

Coulthart was found with the zip tie around his neck and his shallow grave had been covered in concrete with a black Cadillac parked over it, according to cops.

“She killed the victim by placing a zip tie around his neck,” an unidentified witness cited in a police report told investigators.

“She covered the body with cement so that the dog would not dig it up again.”

As to Johnson’s potential motive, the witness told detectives that “he was aware of her ‘getting rid’ of a boy because he was ‘aggravating and irritating her.’”

The “boy” was also “threatening to interfere” with custody of her children, the witness added.

Johnson was described as a “dangerous” swindler, known for making up sob stories to get money or favors from strangers.

Five people have already been arrested for accessory to murder after the fact for allegedly assisting Johnson.

She is expected to be extradited Friday from Jackson County to Walton County.