She’s a killer — and now a “victim” of identity theft.

Millionaire mom Gigi Jordan, who was convicted of murdering her 8-year-old autistic son, claims someone has racked up thousands of dollars in charges on her American Express credit cards while she sat behind bars for the 2010 slaying.

She’s suing the credit-card company for allegedly doing nothing to investigate her claims — and for refusing to transfer her accrued 850,000 reward points.

In her Manhattan Supreme Court lawsuit filed Friday, Jordan says she got suspicious in January after receiving a notice that replacement cards and changes to her PIN and billing address had been requested on her AmEx cards.

She also learned that “thousands of dollars of fraudulent purchases” were made on her card between Dec. 10, 2014, and Jan. 25, 2015 — shortly after she’d been convicted of manslaughter in the death of son Jude Mirra.

AmEx did little to help Jordan deal with the bogus charges and wrong information, the suit says.

AmEx didn’t return messages for comment.