A reporter with the News Leader in her late twenties, who is tall and slim with bobbed brunette hair. She initially seeks a story from Decker but ends up joining him as an investigator.

Decker's former partner, a tough detective and the only female officer in the Burlington Police Department. Concerned about Decker's mental state, she encourages his involvement in a school shooting investigation.

A senior FBI agent in his forties with an athletic build who is impeccably dressed. He assembles an elite task force, seeing potential in Decker and Jamison's unique skills.

A medium-height individual with drug tracks on his arms, carrying scars and a tattoo, claiming to have murdered Decker's family as revenge. He preys on victims of unsolved crimes through manipulation.

An individual with augmented mental abilities after a traumatic assault at 16, who is intersex and underwent a sex-change operation to become Billy. Wyatt harbors resentment toward past adversaries, including Decker.

Decker’s former police captain, who is stocky and respects Decker’s abilities as a detective. Although displeased with Decker’s involvement in an investigation, he seeks his help with a high school shooting case.