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Woman pleads guilty in stabbing death of man, toddler in Maryland Heights

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Father, son fatally stabbed in Maryland Heights; woman, girl injured

Police have charged 20-year-old Traveon Sims (left) and 21-year-old Onyai Turner (right) with murder. (Credit: St. Louis County police)

MARYLAND HEIGHTS ( - A 25-year-old woman pleaded guilty Monday to several charges in connection with the stabbing death of her boyfriend's uncle and 22-month-old cousin that occurred in February 2018.

Onyai Turner pleaded guilty to six felonies, including second-degree murder, first-degree robbery and armed criminal action. Her then-boyfriend, Traveon Sims, was sentenced to life in prison in July 2021. 

The attack happened at a home in the 12400 block of Marine on February 15, 2018. Police say one of the victims was hit with a hammer; Malcolm Mathis II, 33, and Malcolm Mathis, III, 22 months, were killed. A 4-year-old girl and her 57-year-old great aunt were also stabbed. Sims later admitted to his role in the attack. 

Turner is scheduled to be sentenced on April 29.

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