章 661: Chapter 605: Just Gutter Oil

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Information about the members of the two tour groups, one large, one small, was delivered, and Jiang Yuan and the members of the Cold Case Squad carefully distinguished among them.

Discussing probabilities, the likelihood that people from the two tour groups chose to commit murder was extremely low. It was even less likely that they colluded with the victim's ex-boyfriend, so, if a murder did occur, it would be a purely random act.

However, one had to admit that such low-probability events could indeed happen.

Jiang Yuan's most dangerous crime scene investigation involved a case where the killer had joined a tour group and committed murders nationwide, also showing a penchant for returning to the crime scene. Jiang Yuan had almost become a prop for the criminal's escalation. It was genuinely not for money, power, fame or profit, but purely for the thrill of killing, a purely antisocial personality, the so-called serial killer type.