A man was charged on Wednesday with murdering his girlfriend and setting the New Jersey mansion they shared on fire — three months after she went missing, according to a report.

Ronald Teschner, 49, was originally picked up by authorities on Sept. 13, one day after the fire, driving the car of his girlfriend, 65-year-old Jacqueline Terrulli, according to the Asbury Park Press.

Inside the girlfriend’s white 2019 Jeep Cherokee, cops found two of her shotguns and jewelry belonging to another resident of their shared $1.7 million Ocean Township home.

The home, on Sept. 12, was the scene of a massive three-alarm fire that prosecutors allege was started by Teschner.

Terrulli has been missing since the day of the fire.

Authorities believe Teschner killed her after she caught him trying to steal some of her jewelry, the report said, citing a police affidavit.

Relatives of Terrulli’s had told police she tried to boot him out of the home over his drug and alcohol use, the police affidavit says.

Teschner, who has a lengthy criminal record, found out about Terrulli’s plan and told a friend in a phone call that he planned to rob her while she was asleep. But Terrulli caught him, the affidavit said.

The suspect later told the friend he “dealt with” Terrulli, wrapping her body in a tarp and dumping it somewhere, the affidavit says.

When Teschner was caught by cops, he was initially hit with several weapons possessions and receiving stolen property charges.

On Wednesday, murder, disturbing human remains, robbery and aggravated arson charges were added.

Meanwhile, there’s still a $10,000 reward for information about Terrulli’s whereabouts.

“Wherever she is, she is there involuntarily, ” Jef Henninger, a lawyer representing the family told the Asbury Park Press.

“She is not there because she wants to be there. She left everything behind. She is the rock of the family, she would not have left them behind.”