Sienna Weir Wiki, Age, Death, Boyfriend, Family, Biography & More

Sienna Weir


Sienna Weir (1999- 2023) was an Australian model and finalist in the 2022 Miss Universe Australia. She died on 4 May 2023 while undergoing treatment for the injuries sustained around a month ago when her horse fell down.


Sienna Weir was born on Friday, 29 October 1999 (age 23 years; at the time of death) in Sydney, New South Wales, Australia. Her zodiac sign was Scorpio. She completed her schooling at SCEGGS Darlinghurst, Sydney in 2017. She pursued graduation and got a double degree in English Literature and Psychology at Sydney University, Sydney in 2022.  She started modelling while studying in college and went on to compete in Miss Universe Australia 2022.

Sienna Weir when she was 15 years old

Physical Appearance

Height: 5′ 8″

Weight (approx.): 55 kg

Hair Colour: Blonde

Eye Colour: Blue

Figure Measurements: 32-25-35


She was born into a Christian family.

Parents & Siblings

There is not much information available about her parents. She had an elder sister, who lives in London, England.

Sienna Weir with her father

Sienna Weir’s mother


She was unmarried.


She was in a relationship with a model named Tom Bull at the time of her death.

Sienna Weir with her boyfriend, Tom Bull


She modelled for various brands and later signed a contract with Scoop Management Agency. She was also working as an editor for the social service organisations Toybox Australia and Pink Tank Events before participating in the 2022 Miss Universe Australia. She revealed during the show that she was anticipating moving to London anytime to live with her sister, nephew, and niece.

Sienna Weir modelling for a brand

Miss Universe Australia

She was one of the 27 finalists in the 2022 Miss Universe Australia. During an interview, she talked about the reason for entering the competition and said that she wanted to move out of her comfort zone, and this type of competition gives a great platform for further opportunities. She also wanted to raise funds for Toybox Australia, a charity for children suffering from Cancer.

Sienna Weir with her parents in the final of Miss Universe Australia 2022

Sienna Weir (extreme right) with other contestants of Miss Universe Australia 2022


She was fond of equestrians since her childhood and started riding horses at the get of 3. She often used to compete in such horse-riding tournaments during her school and college time; however, she would have never thought that this habit would take her life.

Sienna Weir riding a horse during her childhood

On 2 April 2023, she was at Windsor Polo Grounds, Sydney and got critically injured when her horse fell. She was immediately rushed to the Westmead Hospital, Sydney where doctors started treating her. She was put on life-supporting machines; however, on 4 May 2023, she passed away due to the injuries at the age of 23 and was subsequently put off the ventilator. Her friends and fans posted condolences on their social media and mourned her loss.

Sienna Weir was fond of riding horses


  • She was an animal lover and had a pet cat named Alfie.

    Sienna Weir feeding a Giraffe

    Sienna Weir playing with her cat, Alfie

  • Her favourite tourist destination was Kyoto in Japan.
  • Her favourite poet was Edgar Allen Poe, and her favourite genre of literature was Gothic literature.
  • Her nickname was Gremlin.