According to a Reddit thread (by a now-deleted user), it's possible that an unknown perpetrator had been staking out the salon. Perhaps it was a robber posing as a client. Money had been missing from the cash register, so it's not far-fetched to assume that there was a robbery gone wrong, and the perp needed to get rid of the evidence. But it's very possible that missing money could've just been a red herring to throw investigators off — money was still in her purse and bank account. The kidnapper also left no strong DNA evidence at the scene. Everything in the store looked tidy, so it didn't quite look like a robbery.
But that begs the question, what motive would someone have to abduct and kill her? It seems likely that the person had to know Endres's schedule and that no one would be there around noontime. In the episode, two witnesses driving by recalled seeing two people at the front of the store by a car that didn't belong to Endres. They gave slightly differing accounts — one person saw a man and a woman next to a Ford Taurus, another claimed to see two women next to a Chevy Lumina.
Essentially, they saw the same thing: two people, one with shoulder-length hair, next to a blue car. Tammy Fincher, the witness who saw the Lumina, said that the salon door was open and that the Lumina had the Georgia Quail Wildlife tag. Fincher said that their hands were on each other, but she wasn't sure if one was pushing one down or helping one up — either way, it didn't look normal to her, but she didn't stop.
Besides Jeremy Jones, another suspect was a killer named Gary Michael Hilton, who said his favourite place to go was a hair salon. Again, his case didn't pan out because there just wasn't much evidence. Reddit user MrsMisunderst00d also suggested John Wayne Boyer, who was a convicted killer who disposed of victims similar to how Endres was buried. He also wasn't far from the area, and it's possible that he could've been in Georgia during this time frame.
For now, Endres's case remains shrouded in mystery.