In an average year, 38 children die after being left in hot vehicles. So far this year, 39 such deaths have been reported. Automakers have promised to add another layer of protection against these tragedies by committing to add rear seat reminder systems to new vehicles by model year 2025. But a group of grieving parents are pleading with General Motors to follow through with a promise made nearly two decades ago to install high-tech back seat detection systems to GM automobiles. ABC's Jim Ryan is following and joins Tony.