SC Insassen, who planned the murder of mother in 1999

“I wanted to uneasily disguise the story,” said Rossignol. “Sarah said she didn't do it and was very convincing. At that time I believed her.”

Through her research, Rossignol Nickel, a young woman who “saw her mother so similar and also had her mannerisms”, had to know better. Rossignol finally communicated with all three perpetrators.

Bergin, who was treated by severe drug use because of serious mental illnesses, wrote a long letter that told about “the beginning of madness”, which he experienced as a teenager. He wrote that his mental state brought delusions that made him believe that he would kill someone at some point.

In this entry, Berggin reported that Nickel had wanted both her mother and her stepfather dead. Ridgway would also adhere to this claim.

Rossignol received a letter from Nickel shortly before her book was published. It contained a bomb.

Nickel wrote that she had hated her mother and wanted her to think that she would die several times. She wrote that she was delusional at that time and did not understand that her imagination would have consequences. She admitted that she and Ridgway had discussed and planned the murder, but that none of them thought that this would actually happen.

“I wanted it to happen until it actually happened, but until then it was too late to stop it,” wrote Nickel. “Our 'plan' was a delusional imagination based on drugs and mental illnesses, and I really believe that neither John nor I expected the result as it happened.”

Nickel described herself as a “immature, emotionally stunted child”, but claims that she is not “the evil sociopath that she is to me”.

“There is no excuse in the world to excuse what I did,” she wrote.

Rossignol said Nickel's confession blew her. In the years in which she visited and corresponded to her, Rossignol said, it seemed “different Sarahs. Different personas for different situations”.

After her confession, Rossignol saw this facade faded.