Are 2 never-identified customers key to solving yogurt shop murders?

Two men were seen in a Texas yogurt shop just before four teenage girls were killed there in 1991, and some wonder whether identifying them will lead to answers in the unsolved case.

source https://www.cbsnews.com/news/yogurt-shop-murders-are-two-never-identified-customers-key-to-solving-austin-texas-case/