Rosie Roche, a cousin of Prince William and Prince Harry, has died at 20 years old.

Roche, who was the granddaughter of Princess Diana’s uncle, died at her family’s home in Norton, Wiltshire, on Monday, July 14, with a “firearm nearby,” according to a report from The Sun.

The outlet reported that her mother and sister found her after she began packing for a vacation with friends, and a firearm was found close by inside the property.

A coroner in Wiltshire and Swindon has opened an investigation, which has been adjourned until Oct. 25, according to The Sun.

Coroner Grant Davies said that police “have deemed the death as non-suspicious and there was no third-party involvement,” per The Sun.

Roche was a student at Durham University, and was working on her degree in English Literature.A spokeswoman told The Sun that the royal family’s cousin “will be sorely missed.”

In an obituary published by the Yorkshire Post on Saturday, July 19, family members remembered her as a “darling” daughter, sister and granddaughter.

“Roche, Rosie Jeanne Burke. Died on Monday 14th July 2025,” the obituary states. “Darling daughter of Hugh and Pippa, incredible sister to Archie and Agatha, Granddaughter to Derek and Rae Long.”

“Private family funeral. A memorial service will be held at a later date,” it added.

In her emotional witness statement, Lady Gabriella, 43, expressed her belief that her late husband’s “impulsive action” was likely triggered by medication he had been taking in the weeks leading up to his death, according to The Telegraph.

Roche’s family and a spokesman for Prince William declined to comment to The Sun.