Julie Tam, NBCDFW.com
Despite the crime 36 years ago, family members believe one day they will get an answer in the case of 3 missing Fort Worth girls.
The families of three girls who disappeared in Fort Worth 36 years ago are not giving up hope that the case will be solved.
They were last seen at the former Seminary South near Interstate 35W and Interstate 20. The trio went to the shopping center, now La Gran Plaza de Fort Worth, to pick up items they had placed on layaway and to buy Christmas presents for Rachel Trlica's stepson.
Police later found their car in the Sears parking lot.
Rusty Arnold was 11 years old when his sister, Rachel, disappeared. He has spent his adult life chasing every lead he gets. He said he has felt "anger, sadness, lots of tears, lots of hurt" and believes they are dead.
"Rachel was my mentor, my best buddy," he said. "We did a lot of stuff together. I promised my mother the other day, before you die, you're going to know what happened to your daughter. We'll never give up. No stone will ever be left unturned."
The three families say they believe the girls were kidnapped and did not run away. They say they hope someone who knows something will come forward.
"I feel sad, and I think about it all the time," said Richard Wilson, Lisa's father.
"It's been half of my life that she's been missing," said Rayanne Moseley, Julie's mother. "I want to find out something before I die."
A Fort Worth police detective is dedicated to the case. He is waiting for evidence to be processed that may provide new clues in the case.