The case of Mary Vincent is a disturbing and tragic one that garnered significant attention in 2020 due to its horrific nature and the subsequent legal proceedings. Mary Vincent was a 15-year-old girl who was abducted, raped, and mutilated in 1978 in California. The case remained highly publicized not only because of its brutality but also due to the legal battles that ensued, particularly regarding the insanity plea of the perpetrator, Lawrence Singleton. Here are five key facts about Mary Vincent and her case:
Background of the Case

Mary Vincent’s case began on September 29, 1978, when she was abducted by Lawrence Singleton while hitchhiking in Stockton, California. Singleton, who was 22 years old at the time, had a history of violent behavior. After abducting Mary, he took her to a remote area where he raped her and then mutilated her by cutting off her forearms with an axe. Miraculously, Mary managed to escape and find help, leading to Singleton’s arrest.
Perpetrator’s Background and Trial
Lawrence Singleton had a history of violence and was known to have committed other crimes before the attack on Mary Vincent. During his trial, Singleton’s defense team argued that he was insane at the time of the crime, attempting to use an insanity plea to mitigate his sentence. However, the prosecution argued that Singleton was fully aware of his actions and their consequences, countering the insanity defense with evidence of premeditation and control during and after the crime.
Case Details | Information |
---|---|
Date of Abduction | September 29, 1978 |
Age of Mary Vincent | 15 years old |
Perpetrator's Age | 22 years old |
Crime Location | Stockton, California |

Sentence and Aftermath

Despite the brutality of the crime, Lawrence Singleton was sentenced to 14 years in prison, a decision that sparked public outrage given the severity of his actions. The leniency of the sentence was partly due to the jury’s acceptance of the insanity defense to some extent, although Singleton was found guilty of the crimes. After serving his sentence, Singleton was released from prison but was later killed in 1997 while awaiting trial for another crime.
Legacy and Impact
Mary Vincent’s case led to significant changes in how California handles cases involving violent crimes and insanity pleas. It also raised awareness about the need for stricter sentencing laws for violent offenders and better support for victims of violent crimes. Mary Vincent herself became an advocate for victims’ rights, using her experience to push for legal reforms and support services for those affected by similar crimes.
Key Points
- Mary Vincent was abducted, raped, and mutilated by Lawrence Singleton in 1978.
- Singleton's trial featured an insanity defense, which was partially successful in reducing his sentence.
- The case led to public outcry over the perceived leniency of Singleton's sentence.
- Mary Vincent became a victim's rights advocate, pushing for legal reforms and support for victims of violent crimes.
- The case had a lasting impact on California's legal system, particularly regarding violent crimes and insanity defenses.
The story of Mary Vincent serves as a stark reminder of the brutal realities of violent crime and the complexities of the justice system. It highlights the resilience of victims like Mary Vincent, who, despite suffering unimaginable trauma, can become powerful voices for change and advocacy.
What happened to Lawrence Singleton after his release from prison?
+Lawrence Singleton was killed in 1997 while awaiting trial for another crime.
How did Mary Vincent’s case impact the legal system in California?
+Mary Vincent’s case led to changes in how California handles violent crimes and insanity pleas, with a focus on stricter sentencing laws and better support for victims.
What became of Mary Vincent after the trial?
+Mary Vincent became an advocate for victims’ rights, working towards legal reforms and support services for those affected by violent crimes.