KANSAS CITY, Mo. — A southwest Missouri man who confessed this week to plotting to shoot up a "Twilight" showing and a Walmart store was detained in 2009 after threatening a store clerk, police said Saturday.

Bolivar Police Chief Steve Hamilton said Saturday that Blaec Lammers, 20, of Bolivar, followed a female clerk around a Walmart store in 2009, threatening her. He wasn't charged, but was committed for 96 hours for a mental health examination. Lammers, whose own mother turned him in Thursday, faces three felony charges in the alleged shooting plot.

In Missouri, hospitals, law enforcement officials and private citizens can request a person be held against their will for up to 96 hours if he or she appears to be a threat to themselves or others.