Former Cal Poly track and field star Shelby Daniele reportedly died from a brain aneurysm, according to a report on Wednesday.

Daniele's cause of death was revealed last week by the father of a fellow athlete attending the California NCAA Division I school, Brian Brandenburg, in a Facebook post last week.

Brandenburg, who paid tribute to his two daughters, Tori and Eva, on National Daughters Day in the post, shared that Daniele was the "driving force" behind Eva choosing to run Track at Cal Poly.

"My joy is crushed tonight. The young lady that was the driving force in Eva's decision to run Track at Cal Poly, Shelby Daniele, passed away last night of a brain aneurism," Brandenburg wrote.

"Completely heartbreaking. This is Eva's 3rd day of classes and practice. Hug your children every time you can and tell them you love them every day. Please say a prayer for Shelby and her family."

A brain aneurysm is a "bulge in a weak area of a blood vessel in or around your brain" and is considered life-threatening once ruptured, according to the Cleveland Clinic.

Brain aneurysms can affect anyone and at any age and are more common in women, with symptoms varying based on whether it's unruptured or ruptured.

"Up to 6% of people in the US have an aneurysm in their brain that isn't bleeding (an unruptured aneurysm). Ruptured brain aneurysms are less common. They occur in approximately 30,000 people in the US per year."

California Polytechnic State University Track and Field announced Daniele's death on Friday in a touching Instagram post, calling their former star athlete a "role model" and "an incredible teammate and leader."

"She was an incredible teammate and leader. She cared deeply for those around her, had a remarkable heart and was a role model for so many," the school's Track and Field team wrote.

"Shelby was truly one of a kind and will be missed dearly by everyone in the Cal Poly community. Our condolences go out to her family and friends."

The Cal Poly sprinter competed for the Mustangs for five years between 2020 and 2024.

Daniele earned a bachelor's in agriculture in 2023 at California Polytechnic State University.