Manhunt underway in Arkansas after a mom and dad were killed at Devil's Den State Park in front of their young daughters in broad daylight.

Clinton David Brink, 43, and Cristen Amanda Brink, 41, were hiking with their two daughters, ages 7 and 9, on Saturday when the attack occurred. The parents are being hailed as heroes for protecting their little girls. According to police in a statement on Sunday, the Brinks' daughters were not injured and are "safe with family members."

Police have not given further details on how the couple died, but are asking for help in locating the killer. Police issued a statement urging local residents and park visitors to check personal devices for any cell phone videos, photos, security footage, or other materials from the day of the killings.

DESCRIPTION: Police describe the killer as a white man of medium build, wearing dark pants, a dark baseball cap, and sunglasses, as well as a black backpack and fingerless gloves. A composite sketch released Monday evening showed a man with dark eyes, stubble, and thin lips. The man was seen driving toward a park exit in a black vehicle, which might be a Mazda with a license plate covered by electrical or duct tape, police added.

Please do not approach anyone with this description. Call 911 or the Arkansas State Police at 479-751-6663.

Joining Nancy Grace today:

• Andrea Lewis - Partner at Searcy Law in Pam Beach, Florida, Former Felony Prosecutor at Palm Beach County State Attorney's Office - where Epstein was prosecuted, President of the Palm Beach County Bar Association, WEBSITE: searcylaw.com
• Dr. Jeff Gardere - Board Certified Clinical Psychologist, Professor at Touro College of Osteopathic Medicine in NYC, "America's Psychologist" (New York and Connecticut), and Contributing Author: "Practical Parenting: The Cause of Autism;" Instagram/X: @DrJeffGardere, Facebook.com/DoctorJeffGardere
• Ron Bateman - Former Sheriff for Anne Arundel County, Maryland, Former Homicide and Undercover Narcotics Detective. Ronbatemanbooks.com, Author of his Crime Trilogy, "Silent Blue Tears" (and currently directing and producing a film documentary on the murders at the Capital Gazette Newspaper in Annapolis); X: Ronbatemanbooks
• Chris “Turtle Man” Adams - Swamp Survival Expert and Environmental Educator; Facebook: Turtleman Chris Adams, Instagram: @GAturtleman
• Dr. Priya Banerjee - Board Certified Forensic Pathologist and Anatomic Pathologist, Anchor Forensic Pathology Consulting
• Ninette Sosa - Former Reporter at KNWA in Arkansas, Currently a Professor at the University of Arkansas; Instagram & X: @NinetteSosa
• Sydney Sumner - CRIME STORIES Investigative Reporter