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A professor of emergency medicine and medical toxicology took the stand. Dr. Christopher Holstege broke down for jurors how much cyanide exposure would end a person's life. When Rosemarie Essa died, she had a fatal amount of the poison in her system. The professor lectured to the jury: Cyanide poisoning causes a number of different arrhythmias. That's what makes it tricky, clinically.

By all accounts, Richard Carno had no enemies; so when he was found dead in his car with a bag taped over his head, investigators wondered who could have done it; a trail of evidence would point to those closest to him: his wife and brother-in-law.

Mark Richards was paralyzed in a car accident; his live-in caregiver, Gloria Guzmán, was also his wife; when she called 911 to report that Richards had drowned in his bath, paramedics were suspicious.

Successful Atlanta entrepreneur Lance Herndon usually got what he wanted, but when he is found bludgeoned to death in his waterbed, it appeared he got more than he could handle, possibly due to a business deal gone wrong or a girlfriend's revenge.

When an unknown assailant guns down sheriff-elect Derwin Brown shortly after winning his election, investigators suspect a political assassination, only to instead uncover an extensive trail of corruption.

The state mechanical inspector claims that the red SUV used in the deadly parade crash was working fine, and the crash was intentional.

The state patrol officer on the stand testifies that he saw more than one bullet hole on the red SUV that investigators said Darrell Brooks used to plow into the holiday parade crowd.

Wisconsin State Crime Lab experts collect and analyze DNA evidence from the 2010 Ford Escape found abandoned after the deadly parade crash; five people are found dead at the scene; an eight-year-old boy passes away in the hospital.