At the age of 18, in the town of
St. John, Missouri, Lannert shot her father twice while he was sleeping on a sofa. After confessing to killing him, she said that he had repeatedly raped and abused her as a child, threatening her so she would maintain secrecy. She said that, based on fears for her sister, she had decided to kill him to stop him. She testified that on July 4, 1990, she and her sister got home late, entering the house via a basement window at approximately 4:15–4:30a.m. Seeing a
rifle, she decided to kill her father. Finding her father asleep on the sofa, she shot him. This shot broke his
collarbone and startled him awake. In fear, Stacey closed her eyes and shot again. The next day, she consulted with an adult friend, who encouraged her and helped her to dispose of the murder weapon. She called the police, initially pretending to have found her father dead on the sofa upon returning home, but then confessed the murder to Lt.Tom Schulte, saying it was because of the years of abuse she had suffered. Stacey Lannert was charged with
first degree murder and other
felonies. Lannert's lawyer offered the defense of
insanity or mental defect after his attempt to use the "
battered spouse syndrome" in her defense. In a pre-trial ruling, the court limited mention of "battered spouse syndrome" but allowed the defendant to make "an offer of proof of self-defense". The St. Louis County prosecutor,
Bob McCulloch, never called Schulte to testify, although he was the first official to talk with Lannert and had years of experience with sexual abuse victims. The prosecutors alleged that she murdered her father because she wanted his money. Lannert claimed that her father had sexually abused her from the age of eight. She said although she had reported the abuse to her
guidance counselor,
babysitter, and
psychiatrist, no one took action to help her. During his instructions to the jury, the judge refused to include any claim of
self-defense: "[Under] Missouri law, the self-defense argument was not valid because she wasn't in actual danger at the moment she pulled the trigger." The judge concluded that there was not any basis in the evidence for her claim of self-defense. Despite several expert witnesses having testified and agreed during Lannert's trial (and later appeal) that Lannert showed signs of abuse, the jury found her guilty on December 15, 1990, and later in 1992 and sentenced her to life imprisonment, without (as required by applicable law) the possibility of parole. Her sister, Christy, was tried and convicted of
conspiracy to commit murder. She was sentenced to five years' imprisonment. She was released on parole after serving two and a half years. ==Time served and appeals==