This movie isn't the best murder mystery out there, but they did set up a few options for who might have been the killer in the second set of murders.
There were a few things that I have to question, though. Like how did the aunt lose track of Natalie literal SECONDS after she walked out the door? Unless Natalie has super-speed, she couldn't have gotten farther than to the end of the driveway in that amount of time. Or how the bartender (former police officer, who was the first on the scene of the original killings) admitted to destroying evidence even though he had no real reason to, and how, even after admitting it, he seemingly wasn't punished for it.
There were a few things that I have to question, though. Like how did the aunt lose track of Natalie literal SECONDS after she walked out the door? Unless Natalie has super-speed, she couldn't have gotten farther than to the end of the driveway in that amount of time. Or how the bartender (former police officer, who was the first on the scene of the original killings) admitted to destroying evidence even though he had no real reason to, and how, even after admitting it, he seemingly wasn't punished for it.