
This episode of 48 Hours Mystery covers the case of Lisa Buchanan, her relationship with Dr. Chris Koulis, and the events leading to her death from a drug overdose. Key discussions include the dynamics of their relationship, the role of drugs, and the subsequent trial of Koulis for murder.
Lisa Buchanan, described by her sister Tara Bentley as creative and free-spirited, had a tumultuous relationship with Koulis, who was both her boyfriend and doctor. Their final weekend together in July 2005 involved drug use and sexual encounters that ultimately led to Lisa's overdose.
Investigators, including lead investigator Eric Anderson, believed Koulis was responsible for supplying and administering the drugs that killed Lisa. Despite Koulis's claims of innocence, evidence pointed to his manipulative behavior and control over Lisa.
The trial featured graphic video evidence of their final hours together, which jurors had to view. Koulis was ultimately convicted of criminally negligent homicide but acquitted of murder, leading to a sentence of two years in prison.
In a tragic twist, Koulis died from a drug overdose five years later, leading to further legal battles regarding his conviction.
Lisa Buchanan's death from a drug overdose leads to Dr. Chris Koulis's trial for murder, revealing a toxic relationship and manipulation.

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