Two highly thought-of, loved women go missing.

Andrea Knabel dedicates her life to finding missing people and volunteering with the National Organization of Missing in America. Three years ago, Knabel's name was added to the list of those missing.

The 37-year-old was last seen leaving her sister's house in the middle of the night on foot. Her family says she was upset and going through a rough patch. The movement of her phone has been tracked but not found. Her family is still hopeful.

Cynthia "Linda" Alonzo had plans for Thanksgiving. The 48-year-old mother lived with her daughter and grandchildren in Oakland, California. She also had a romantic relationship, but the upcoming holidays were family time.

Alonzo spoke to one of her daughters by phone, confirming traditional plans of a get-together at Alonzo's mother's home in San Francisco, but she never made it.

What happened to Linda?

Joining Nancy Grace Today:

Mike Knabel - Father of Andrea
Erin Knabel - Sister of Andrea, TikTok: @ErinKnabel, Twitter: @erin_knabel
Wendy Patrick - California prosecutor, author “Red Flags;" "Today with Dr. Wendy" on KCBQ in San Diego; Twitter: @WendyPatrickPHD
Dr. Shari Schwartz - Forensic Psychologist (specializing in Capital Mitigation and Victim Advocacy); Twitter: @TrialDoc; Author: "Criminal Behavior" and "Where Law and Psychology Intersect: Issues in Legal Psychology"
Joe Scott Morgan - Professor of Forensics: Jacksonville State University; Author, "Blood Beneath My Feet;" Host: "Body Bags with Joseph Scott Morgan"
Mark Oprea - Freelance Journalist (Cleveland, OH), covered the story for "Narratively;" Twitter: @mark_oprea
Susan E. Williams - South Carolina Criminal Defense Attorney; Former Prosecutor (Summerville); Instagram: @carolinaladylawyer, Twitter: @ATTYswilliams
Caryn Stark - NYC Psychologist; Twitter: @carynpsych, Facebook: "Caryn Stark"
Dana Kennedy - Senior Reporter, New York Post; Twitter/Instagram: @DanaKennedyLive; Facebook: "Dana.Kennedy"

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Two Women Vanish into Thin Air? What Happened to Andrea and Linda?