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Kristin Rossum

Kristin Rossum is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Kristin Rossum rather than just read about it. In short: Kristin Margrethe Rossum (born October 25, 1976) is an American former toxicologist who was convicted of the murder of her husband Gregory T. de Villers, who died from a lethal dose of fentanyl on November 6, 2000. Rossum is serving a life sentence at the Central California Women's Facility in Chowchilla.

Key takeaways

  • Kristin Rossum belongs to science; place it in that map before memorising details.
  • Learn the definition first, then one example that makes the definition concrete.
  • Connect Kristin Rossum to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of Kristin Rossum from memory before moving on to harder problems.

Reference excerpt

Kristin Margrethe Rossum (born October 25, 1976) is an American former toxicologist who was convicted of the murder of her husband Gregory T. de Villers, who died from a lethal dose of fentanyl on November 6, 2000. Rossum is serving a life sentence at the Central California Women's Facility in Chowchilla.

Background Kristin Rossum was born in Memphis, Tennessee. She grew up in Claremont, California, the oldest child of Ralph and Constance Rossum. Her father is a professor and her mother worked at Azusa Pacific University. She has two brothers. In 1991, after her father accepted the position of President of Hampden–Sydney College, the family moved to Virginia and Kristin enrolled at the all-girls St. Catherine's School in Richmond. There, Rossum began drinking beer and smoking cigarettes. She also tried marijuana, but said it had little effect. Starting in 1992, she began using methamphetamine. In 1994, Rossum moved back to California and enrolled part-time at the University of Redlands and moved into a dormitory on campus, but eventually left following a relapse. After overcoming her addiction and beginning her relationship with Greg de Villers, Rossum enrolled at San Diego State University and graduated with honors in 1998. After graduating, she worked as a toxicologist at the San Diego County medical examiner's office. Rossum and de Villers married in 1999. The following year, she began an extramarital affair with her boss, Dr. Michael Robertson.

Murder In late 2000, de Villers had learned about both the affair and her resumption of her meth habit, threatening to expose both to the medical examiner if she did not quit her job. Robertson, who also knew Rossum had relapsed, learned of this threat prior to the death of de Villers. On November 6, 2000, just after 9:15 p.m., Rossum dialled 9-1-1 and reported that de Villers had committed suicide. Paramedics found him lying unresponsive on the couple's bed, which was sprinkled with red rose petals; he was pronounced dead on arrival at the hospital. Rossum told authorities he had committed suicide. Despite her claims, de Villers's family – particularly his brother, Jerome – were adamant that he was not suicidal. However, San Diego police were initially reluctant to open an investigation. One month after de Villers' death, Rossum and Robertson were both fired from the medical examiner's office – Rossum for hiding her meth habit, and Robertson for enabling her meth habit, as well as for fraternization with a subordinate. Due to potential conflicts of interest, the San Diego medical examiner outsourced de Villers' autopsy to an outside lab in Los Angeles. The tests showed de Villers had seven times the lethal dose of fentanyl in his system. Under questioning, Rossum told detectives that her husband had been depressed before he died, while her father stated that he seemed to be deeply distressed and that he drank heavily on the night he died. As the investigation continued, police learned about Rossum's relapse, and about a phone call she made to de Villers's employer telling them he would not be coming in to work the day of his murder.

Trial and conviction On June 25, 2001, seven months after de Villers' death, Rossum was arrested and charged with murder. On January 4, 2002, her parents posted her $1.25 million bail. At trial, the prosecution contended that Rossum murdered her husband to keep him from telling her bosses about both her affair and her use of meth stolen from the drug lab. Defense attorneys argued that de Villers was suicidal and poisoned himself. Rossum's brother-in-law, Jerome de Villers, testified that it was difficult to believe his brother had committed suicide because he hated drugs. Rossum's account of the day of death was that she went to work in the morning, then returned in the early afternoon to check on her husband and serve him a bowl of soup. She returned to work, then came home around 7 P.M. where she said she showered and shaved her legs. Upon drying herself, she went to the bedroom where she found her husband not breathing, and called 911. The 9-1-1 tape played in court appeared to indicate Rossum was administering CPR to her husband. The prosecution had presented a store card receipt from Vons where it was shown she had acquired a single red rose. Crumpled rose petals were found on de Villers' corpse akin to the film American Beauty. The defense claimed de Villers' had put the petals on himself for his final action out of suicidal grief, which was refuted by the prosecution who argued that a man of de Villers build having overdosed on fentanyl would lack the energy to accomplish this. The clinching evidence was the credit card receipt, having been timestamped 12:42 P.M., the same time Rossum having claimed to be at home nursing her husband. On November 12, 2002, Rossum was found guilty of first degree murder. On December 12, she was sentenced to life in prison without the possibility for parole, and a $10,000 fine. She was transferred to the Central California Women's Facility in Chowchilla, the largest women's correctional facility in the U.S.

… excerpt ends here. Continue reading the full article.

Worked examples

Example 1 — a first encounter with Kristin Rossum

Start with the simplest possible case. Write down what Kristin Rossum claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Kristin Rossum before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Kristin Rossum ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Kristin Rossum

In research
Kristin Rossum appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry
Engineering practice reuses Kristin Rossum in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom
Kristin Rossum is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1976 births, 2000 murders in the United States, 20th-century American criminals, so understanding it makes those chapters shorter.
In everyday life
Look for Kristin Rossum outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.
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How to study Kristin Rossum in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Kristin Rossum means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain Kristin Rossum out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Kristin Rossum in simple terms?

Kristin Margrethe Rossum (born October 25, 1976) is an American former toxicologist who was convicted of the murder of her husband Gregory T. de Villers, who died from a lethal dose of fentanyl on November 6, 2000. Rossum is serving a life sentence at the Central California Women's Facility in Chow…

Why does Kristin Rossum matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Kristin Rossum?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Kristin Rossum.

Tags

  • 1976 births
  • 2000 murders in the United States
  • 20th-century American criminals
  • American female murderers
  • American people convicted of murder
  • American prisoners sentenced to life imprisonment
  • Criminals from Memphis, Tennessee
  • Criminals from San Diego
  • Fentanyl
  • Living people
  • People convicted of murder by California
  • People from Claremont, California

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