A Treasure Coast woman has just been arrested for the murder of her son, more than 20 years ago. 

Authorities picked up Michelle Lodzinski last night in Martin County. 

Her five year old son, Timothy Wiltsey, disappeared from a New Jersey carnival back in 1991 and his remains were found in a field a few months later. 

The woman had claimed she left him in line at a ride while she went to get a soda and never saw him again. 

The arrest came after police up north did a review of the cold case.

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