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(ABC News) -- Investigators in New Jersey believe they've solved a 23-year-old cold case.

Michelle Lodzinski was arrested Wednesday in Martin County, Florida, and charged with the 1991 murder of her 5-year-old son, Timothy Wiltsey, according to the Middlesex County Prosecutor's Office.

Lodzinksi, 47, told investigators her son disappeared at a carnival at Kennedy Park in New Jersey in May of 1991, police said. His partial remains were found in Raritan Center, an industrial park in Edison, New Jersey, in April the following year.

Her arrest was made after a routine review of evidence in the case, said Middlesex County Prosecutor Andrew Carey. A grand jury indicted her on a first-degree murder charge last Thursday.

Bail for Lodzinski was set at $2 million. It's unclear if she will waive her right to an extradition hearing and return to New Jersey.

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