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How the alleged murder plot unfolded:

Aug. 10 鈥⒙燗 woman later identified as Pamela Hupp approaches a woman in St. Charles County, saying she is a producer for "Dateline" and will pay the woman to use a script to act out the recreation of a 911-call scenario to be used on the show, according to police. The woman first agrees to get in Hupp's SUV, but later gets suspicious and asks to be taken home. She reports the incident to police.

Aug. 16

11:25 a.m. 鈥⒙燙ellphone data shows Hupp at Louis R. Gumpenberger's apartment complex in St. Charles, where she spends about four minutes, police say. Gumpenberger, who sustained brain damage in an auto accident in 2005, is known to walk around the area.

12:08 p.m. 鈥⒙燞upp places a 911 call from her O'Fallon home, claiming a man is accosting her and trying to enter her home, then that she has shot him after he burst in. Police arrive to find a man later identified as Gumpenberger dead.

Tuesday

11 a.m. 鈥⒙燞upp is arrested on murder and armed criminal action charges while driving near her home. Authorities say she set up Gumpenberger to frame "someone else." She is聽taken to the police station

About noon 鈥⒙燞upp stabs herself in the neck and wrists with a pen in a women's restroom after telling police she needed to use the toilet. She is taken to a hospital, where police say she is stable.

Source: St. Charles County Prosecuting Attorney's Office