A former Walmart worker was charged Wednesday with the brutal 1984 murder and rape of a 16-year-old Long Island girl — ending decades of mystery and speculation, Nassau County prosecutors announced.

Richard Bilodeau was arraigned on murder charges for the Nov. 10, 1984, cold-case slaying of Theresa Fusco, thanks to high-tech DNA testing by the FBI, authorities said.

“The DNA was taken from a vaginal swab,” Nassau County Assistant District Attorney Jared Rosenblatt said in court. “The defendant worked the overnight shift at Walmart in Suffolk County.

Richard Bilodeau is escorted into court in Nassau County Wednesday, Oct. 15, 2025. Kevin Sheehan / NY Post

“When questioned, the defendant denied knowing her,” Rosenblatt told Judge Helene Gugerty. “He denied recognizing the pictures of he

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