Nick Reiner appeared noticeably different in the days leading up to the deaths of his parents, Rob and Michele Reiner — coming off as “drained” and “abnormal” … according to gas station employees who say they’ve known him for years.

TMZ spoke with multiple employees at a Sinclair gas station in Brentwood, a spot they say the Reiner family frequented regularly.

One employee tells us they last saw Nick about two weeks ago, recalling he looked tired and was unusually standoffish.

At the time, Nick purchased a pack of Marlboro Lights, which employees say was routine for him. They add that he did not appear to be under the influence of drugs or alcohol.

The New York Post obtained surveillance video showing the 32-year-old walking through the gas station in the early hours of Sunday morning … just hours before Rob and Michele were killed.

We’re told the Reiners were loyal customers, with one employee saying they’d known Nick for  15 years … and the news has left staff stunned.

Nick Reiner was arrested hours after his parents were found stabbed to death Sunday … he’s been charged with two counts of first-degree murder.

Police are investigating TikToker Riziki Ilenre‘s death after numerous reports surfaced that she died by suicide.

The Montgomery Police Department in Alabama tells TMZ they are investigating the circumstances of her December 12 death.

Riziki had previously spoken out about her mental health struggles over the years. She was a law student at Illinois Institute of Technology and heavily involved in her local ministry. She was also known for her close relationship with her service dog, Chief.

RIP

David Harbour was captured on video doing some “Stranger Things” in Encinitas, California over the weekend … the actor appeared to take a man’s hat and make a run for it.

The head-scratching incident appears to have gone down Saturday at a gastropub called Encinitas Ale House.

Here’s what the video — which we were only permitted to view — shows … David enters the joint and then — a short time later — runs outside, carrying a white cap in his hand. He then looks over his shoulder, yelling, “C’mon, dude, f****** get me.”

David himself has candidly discussed being diagnosed with bipolar disorder in the past.

This comes after the “Stranger Things” actor had been under fire for a report claiming his costar Millie Bobby Brown filed a bullying and harassment complaint against him while filming the final season of the Netflix show. Executive producer Shawn Levy and Millie herself have come out and categorically denied those claims.