Prosecutors will upgrade charges against the stepmother of 2 children who disappeared earlier this year to aggravated child abuse after she is transferred to Mobile from a Louisville, Kentucky, jail, authorities said Thursday.

Heather Leavell-Keaton, 22, was being held on lesser child abuse charges in Louisville after her common-law husband’s 4-year-old daughter and 3-year-old son were reported missing, and possibly dead, last month. She is expected to arrive in Mobile on Sunday.

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