CLAYTON, Mo. (AP) — Prosecutors trying a suburban St. Louis woman for allegedly fatally shooting a disabled man to divert attention from herself in her friend's stabbing death won't be allowed to present evidence about her mother's death.

KSDK-TV reports that St. Charles County Circuit Judge Jon Cunningham ruled Monday that Shirley Neumann's death won't be discussed when her daughter, Pamela Hupp, goes on trial in September. Hupp's facing a murder charge in the 2016 killing of Louis Gumpenberger. Prosecutors allege Hupp attempted to make it appear Gumpenberger tried to kidnap her to recover insurance money she received after her friend's killing. She's pleaded not guilty.

Hupp's mother was found dead in 2013 beneath the balcony of her senior living community apartment near Fenton. Initially deemed "accidental," the death later was reclassified as "undetermined."

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Information from: KSDK-TV, http://www.ksdk.com