Speculation is swirling after a 26-year-old woman mysteriously died on a Caribbean bachelorette party hosted by the fiancée of Indiana Pacers star Tyrese Haliburton.

Makenzi Kern was pronounced dead on June 8, just two days after her birthday, while 'surrounded by her closest friends on a once in a lifetime trip to St. Barthelemy Island,' an online obituary says.

A source familiar with the situation told TMZ Kern passed away unexpectedly from health complications, and her family does not suspect foul play, nor do they believe her death is related to drugs or alcohol.

Theories about what may have caused the young woman's death, however, have run rampant. 

A woman who claims to know the family also posted online that Kern died of a sudden heart attack. 

Rumors have spread online - with some speculating that Kern's death may be a result of a reaction to the controversial mRNA COVID vaccines.

'Sounds sudden and vaxxy,' one X account posted.

Laura Miers, an outspoken critic of the COVID vaccines, also wrote that 'the New Normal really blows. 

'We will be witnessing record premature death for the rest of our natural lives.'

There is no evidence to suggest Kern died as a result of receiving the COVID vaccine.

The native Iowan was pictured enjoying herself on St Bart's beaches and aboard a boat in the surrounding waters in photos Haliburton's fiancée Jade Jones posted online on June 6 - just two days before Kern mysteriously passed away.

Like Haliburton and his fiancée, Kern attended Iowa State, where she was a cheerleading teammate of Jones'. Neither Haliburton nor Jones have commented publicly on last week's tragedy in St. Barthelemy.

She is now survived by her parents, step parents, sister, step siblings, grandparents and her boyfriend. 

'She loved the water,' read Kern's obituary. 

'She talked her mom into going to the pool to go swimming in the middle of a rain storm during their trip to Disneyworld. 

'She was a mama's girl those early years and could talk her into just about anything. 

'She loved boating with her dad, water skiing, and got to try out a seabob for the first time in St Barths. 

'According to her friends, they had to drag her off because she loved it so much, evidence that she was having an amazing time.'

'Kenz,' as she was known, was working as a membership director for a YMCA branch in Nebraska.

Jones posted photos of the trip on June 6, showing herself with eight or so friends around the island.

'Hopped on a flight to cloud 9,' Jones wrote on June 6.

Jones and Haliburton have been together for more than seven years, dating back to his time as a rising guard for the Iowa State Cyclones. Haliburton would go on to be drafted by the Sacramento Kings in 2020 and was later traded to the Indian Pacers, whom he led to the 2025 NBA Finals.

Unfortunately, he suffered an Achilles injury during the Finals loss to Oklahoma City and consequently missed the 2025-26 season.