Authorities say a Massachusetts woman has admitted plotting with a New York man to murder his wife, who was shot to death as the couple walked with their toddler son along a northern New Jersey street.

Antoinette Stephen (Morris County Prosecutor's Office)

Antoinette Stephen of Billerica entered her plea two weeks ago. But it wasn't made public until this week, when Morris County prosecutors noted it during a status conference.

The 28-year-old Stephen pleaded guilty to murder, conspiracy and weapons offenses in the August 2011 slaying of 27-year-old Nazish Noorani. She also will cooperate in the case against Kashif Parvaiz, a 27-year-old Brooklyn resident who allegedly paid Stephen to shoot his wife.

The shooting occurred as the couple walked in Boonton. Authorities say Stephen also wounded Parvaiz to make it look a random racial attack.

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