(Newser) – Authorities say the body of a 22-year-old woman who went missing in California in mid-November after leaving a rehab center was found in her car in a Walmart parking lot on Feb. 3—and it had likely been there for months, KTLA reports. The car in which Lauren Moss was discovered had tinted windows and a sunshade on the windshield, though employees who work at the Salinas store say the car, which they'd noticed in the lot for some time, didn't seem suspicious, per the Salinas Californian.

It was only when workers finally started peering into the car last week that they noticed what appeared to be a decomposed body and called police. Security video showed the car had been parked there since at least mid-December, though the footage only goes back 60 days. No cause of death has been determined, but cops suspect Moss killed herself, and her sister tells KSBW a suicide note and drug needle were found in the car. (Meanwhile, here's the mysterious case of an Alabama teen who disappeared 19 years ago.)