CHESTERFIELD, Mo. ( -- A woman is facing second-degree murder charges Saturday after a man in his 40s was struck and killed in a Chesterfield Valley parking lot. 

Chesterfield police said Kathryn Marsh, driving a black Dodge Ram, ran over her boyfriend Matthew Baker in a parking lot near Babbo's Spaghetteria on Chesterfield Airport Road around 2:30 p.m. Friday. He was pronounced dead at the scene. 

A witness told News 4 Baker and Marsh were arguing in the parking lot before the incident happened. 

Police said Marsh was cooperative with law enforcement during the investigation. 

After a thorough investigation police determined Marsh intentionally hit Baker intending to cause serious injury.

Police said an autopsy will help determine exactly how many times Baker was run over. 

A dog found in the Dodge Ram was later determined to belong to Baker, and has since been taken by Animal Control.

Marsh, of Defiance, Missouri, is being held on a $500,000 bond at the St. Louis County Justice Center.

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