Cold Truth by Mariah Stewart

Twenty-six years ago, Cassie Burke's parents and younger sister were murdered. Today she is a homicide cop. When the small community is again shocked by killings that seem to be related to those committed years ago, Cassie is grateful for the help of FBI agent Rick Cisco. When her cousin is attacked and nearly murdered, the hunt for the killer is stepped up and Regan Landry is included in the searching. Stewart writes a thrilling mystery setting up the base for Landry's character for future stories.