The main suspect featured in episode 3 is James Lewis, who was arrested on suspicion of rape years after the murders. The episode reveals that a victim's daughter uncovers forgotten evidence supporting a controversial theory involving Lewis, including connections to Johnson & Johnson products through his deceased daughter’s medical records, suggesting a possible motive linked to the company’s products.

In episode 3, a victim's daughter actively searches for justice decades after the murders. She uncovers forgotten evidence that supports a controversial theory about the case, which brings new attention to suspects and possible motives previously overlooked by investigators.

Another credible suspect mentioned is Roger Arnold. He becomes a suspect but later shoots the man who reported him, leading to his imprisonment. This development complicates the investigation and shifts some focus away from him.

The episode suggests a controversial angle involving Johnson & Johnson, highlighting that the company was quick to destroy the tainted tablets and allegedly lied about the presence of cyanide. It also explores potential motives connected to Johnson & Johnson products, such as the sutures used in James Lewis’s daughter’s heart surgery, which were trademarked by the company.

Episode 3 discusses a potential motive related to James Lewis’s personal tragedy—his daughter’s death due to a failed heart surgery involving sutures trademarked by Johnson & Johnson. This suggests a vengeful motive against the company, which was not previously considered in depth by investigators.