In her final post on Instagram, dated November 23, 2020, Alexis Sharkey gushes about her Mexican holiday.

"Today I decided I’m moving to Tulum for the sinks and overall aesthetic. I’ve never been so obsessed with the vibe of a town in my life," she writes next to a selfie from a beautiful Instagram-worthy bathroom.

⁣But it's the last post on the 26-year-old's colourful feed, which is full of glamourous pictures of the Instagram influencer, who hasn't gone more than a few days without posting on her page in years.

Now, the picture diary of the American's life is just that. A memorialised, almost-daily update from a young woman's travels through Texas, the Caribbean, Colorado, and the Bahamas. A picture book of her love story with husband Tom Sharkey, a peek into her favourite products and routines and clothes, and an insight into the friends and hobbies she surrounded herself with.

As a stranger looking in, you feel like you know her. Or knew her. All thanks to the accessibility of the industry she has built a career in.

After exchanging text messages with friends and family on Friday November 27, the day after Thanksgiving, Alexis' phone went quiet from about 6pm. She'd reportedly left her apartment on foot after an argument. We don't know who with.

As the weekend stretched on her husband and family started to grow worried, sending out requests on their social media as they tried to track her down. Her job was her phone - it was highly unusual for her not to be contactable on it. It was even more unusual for her not to have posted on her social media in 24 hours.

Unbeknownst to them, a body had been found on the side of the road in Houston at 8.30am on Saturday morning, and a crime scene had been erected only kilometres from Alexis' and Tom's apartment.

The driver of a sanitation truck on his morning route had seen two feet sticking up in the grass and quickly called police. The woman found had been dead for hours, but according to investigators, her body showed no signs of injury or trauma.

It would take 24 hours to confirm her identity as Alexis. But police are still waiting for an autopsy to tell them how she died.

Her family say they don't need an autopsy to know that she was murdered.

"The way in which she was found - my child would never do that to herself," her mother Stacey Robinault, told KPRC-TV.

Watch: Alexis' mum on their final conversation. Post continues after video.

"That doesn't even make sense. That is absolutely foul play. There is nothing to me that suggests that this was an accident. And there's nothing to me that suggests anything else, other than that this was done to her. I do believe she was murdered, yes. From what I've been able to gather as well as mother's gut."

Her friends believe the same thing.

"I'm going to be honest, she confided in me about how worried she was for her safety when we went to Marfa, Texas, almost a month ago. We were sitting down at dinner and she lost it. We walked back to our hotel room and she confided in me that night in things. I looked at her [and thought]: 'She's petrified. This girl is scared for her life'," one of them told ABC13.

Petrified of who, however, she wouldn't disclose.

Theories have flooded the internet. Was it a jealous stalker? An obsessed fan? Or was it someone she knew? Her husband, Tom Sharkey, 49, has been inundated with death threats with fans accusing him of being involved.

Alexis had only moved to Houston from Texas in January to be with her husband who she married in 2019. She'd taken a year off pursuing medical school to see where her new found social media fame would take her.

But despite the romantic pictures shared online, her friends have told American media outlets her relationship was crumbling, and she had plans to separate.

"She was a very private person, she didn't share a lot about what was going on at home. Recently she opened up to us about it, and divorce was being filed," one of her friends told KHOU.