A couple found in August with a child's body in a duffel bag as they tried to cross the U.S.-Mexican border were charged Friday with murder and torture.

>>Read: Toddler's body found in bag at U.S.-Mexico border

Mercy Mary Becerra, 43, and Johnny Lewis Hartley, 39, were arrested and charged with four counts of murder, human trafficking to commit pimping/pandering, torture and assault on a child causing death, according to the Los Angeles County District Attorney's Office.

The couple trafficked a woman between November 2012 and August 2016, according to prosecutors. They also seized the woman's daughter, then abused, tortured and killed the 2-year-old girl around Aug. 9, authorities said.

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Becerra and Hartley were stopped by authorities when they tried to enter the country through the San Ysidro Port of Entry.