Authorities have determined that Saoirse Kennedy Hill, the 22-year-old granddaughter of assassinated presidential candidate Robert F. Kennedy, died of a drug overdose.

WCVB-TV reported that a toxicology test found methadone, fluoxetine, norfluoxetine, diazepam, nordiazepam and alcohol in her system.

Fluoxetine is an antidepressant, and diazepam is used to treat anxiety and alcohol withdrawal symptoms.

Saoirse Kennedy Hill died from an accidental drug overdose. Photo / Supplied
Saoirse Kennedy Hill died from an accidental drug overdose. Photo / Supplied

Hill was found unresponsive at a home at the Kennedys historic compound on Cape Cod on August 1. She was pronounced dead at Cape Cod Hospital.

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Our hearts are shattered by the loss of our beloved Saoirse," the Kennedy family said in a statement to The New York Times at the time. "Her life was filled with hope, promise and love."

Saoirse Kennedy Hill, fifth from right, with the Kennedy clan. Photo / Supplied
Saoirse Kennedy Hill, fifth from right, with the Kennedy clan. Photo / Supplied

Hill was scheduled to start her senior year at Boston College. She was the only daughter of Robert and Ethel Kennedy's fifth child, Courtney, and Paul Michael Hill.

Belfast-born Paul Hill was one of the Guildford Four, the group that was wrongfully convicted of the 1972 Guildford IRA pub bombings.

He was wrongfully imprisoned for 15 years and was released in 1989.

In 1993, he married Courtney Kennedy on a boat in the Aegean Sea after they were reportedly introduced by Ethel Kennedy.

Saoirse Kennedy Hill had written frankly and publicly about her struggles with mental health and a suicide attempt while in high school.

Saoirse with her mother Courtney, the daughter of Robert F. Kennedy. Photo / Supplied
Saoirse with her mother Courtney, the daughter of Robert F. Kennedy. Photo / Supplied

She previously attended the private preparatory school Deerfield Academy, where she once wrote an op-ed about her battles.

"My depression took root in the beginning of my middle school years and will be with me for the rest of my life," she wrote in the February 2016 article. "Although I was mostly a happy child, I suffered bouts of deep sadness that felt like a heavy boulder on my chest. These bouts would come and go, but they did not outwardly affect me until I was a new sophomore at Deerfield."

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Kennedy Hill revealed in the op-ed that someone she "knew and loved broke serious sexual boundaries" with her before her junior year of high school. "I did the worst thing a victim can do, and I pretended it hadn't happened. This all became too much, and I attempted to take my own life," she wrote.

"We are all either struggling or know someone who is battling an illness," she wrote. "Let's come together to make our community more inclusive and comfortable."

Tragedy has struck the Kennedy family countless times through the years. RFK and President John F. Kennedy were assassinated, their brother Joseph Kennedy Jr. was killed during World War II and their sister Kathleen Cavendish died in a plane crash. Two of JFK's three children with wife Jacqueline Kennedy Onassis, John F. Kennedy Jr. and Patrick Bouvier Kennedy, also met untimely deaths.

WHERE TO GET HELP:

If you are worried about your or someone else's mental health, the best place to get help is your GP or local mental health provider. However, if you or someone else is in danger or endangering others, call police immediately on 111.

OR IF YOU NEED TO TALK TO SOMEONE ELSE:

0800 543 354 (0800 LIFELINE) or free text 4357 (HELP) (available 24/7)
https://www.lifeline.org.nz/services/suicide-crisis-helpline
YOUTHLINE: 0800 376 633
• NEED TO TALK? Free call or text 1737 (available 24/7)
KIDSLINE: 0800 543 754 (available 24/7)
WHATSUP: 0800 942 8787 (1pm to 11pm)
• DEPRESSION HELPLINE: 0800 111 757 or TEXT 4202