Sierra Barter has wondered if her step-grandfather could have been a serial killer.

“I remember my mom mentioned she Googled the Santa Rosa Hitchhiker Murders,” the 32-year-old told Fox News Digital. “She was freaked out about it. … And I was just like, ‘This is too much. I can’t think about this right now.’

“But then, maybe a couple of days later, I went, and I looked at it – really looked at it,” she shared. “It shook me. It is not a fun thing to imagine that somebody that you spent time with or that you have photos of yourself with … could have committed these kinds of crimes. … It’s an unsettling feeling.”

Sierra Barter said she “gained her family back” after the documentary’s release. (Max)

“I’m just really happy I gained my family back,” Barter said. “It’s not fun to have a fractured family. … But I’m grateful that I don’t have to live with Jim lurking in the sphere anymore. … And I’m so grateful to be surrounded by a group of women reminding me to speak up.

“There’s not a lot of Jim’s childhood that survived,” Barter reflected. “I can only assume that people who are hurt tend to hurt other people. But I don’t want to make excuses for him. There is always an opportunity to get help, which he did not choose to do. I’m not sure why he did the things that he did. I think he was feeling powerless, and that’s why he took his anger out on people and tried to take their power. 

Sierra Barter is hopeful for justice for the victims of the Santa Rosa Hitchhiker Murders. (Max)

“But, frankly, I’m not so sure if I want to know why. I’m just thankful that these women are now speaking up against him. He’s not able to rest with the idea that he was this great man because we all know that he was not.”