(CNN)A granddaughter of Robert F. Kennedy died after being found unresponsive Thursday at the Kennedy compound on Massachusetts' Cape Cod, officials say.
Saoirse Kennedy Hill, 22, was the daughter of Courtney Kennedy Hill, one of the 11 children of the late presidential candidate and the environmental and human rights activist Ethel Kennedy.
The cause of death wasn't immediately released. But an autopsy Friday revealed no trauma except that consistent with lifesaving measures, said the area's district attorney, Michael O'Keefe.
"Our hearts are shattered by the loss of our beloved Saoirse," the Kennedy family said in a statement released Thursday evening. "Her life was filled with hope, promise and love."
Her grandmother, Ethel Kennedy, said in the statement, "The world is a little less beautiful today."
First responders were called to a medical emergency at the Kennedy compound in Hyannis Port around 2:30 p.m. Thursday, Hyannis Fire Lt. David Webb said.
The Boston College communications student was taken to a hospital, where she was pronounced dead, O'Keefe said.
Authorities are awaiting results of a toxicology report, O'Keefe said. Police in Barnstable, the town that includes the Hyannis Port village, are investigating the death with state police detectives, he said.
Saoirse Kennedy Hill.
She was due to graduate next year, Boston College said.
She had volunteered in Mexico to build schools in indigenous communities and was "moved by the causes of human rights and women's empowerment," her family said.
"She lit up our lives with her love, her peals of laughter and her generous spirit," the family's statement reads.
The Kennedy compound, a six-acre waterfront property in Hyannis Port, is home to several members of the Kennedy family.
The property captured the nation's attention during the presidency of John F. Kennedy in the 1960s. The presidential helicopter, Marine One, landed there countless times and several high-profile politicians visited it.
Photos: The Kennedy compound, in pictures
US Sen. John F. Kennedy is joined by his fiancee, Jacqueline Bouvier, at the Kennedy compound in Hyannis Port, Massachusetts, in 1953. They had just announced their engagement.
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Photos: The Kennedy compound, in pictures
The Kennedy family poses for a portrait in the 1930s. Joseph Kennedy Sr. and his wife, Rose, had nine children. From left are Patricia, Joseph Jr., Robert, Kathleen, Rose, John, Rosemary, Edward, Joseph Sr., Jean and Eunice.
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Photos: The Kennedy compound, in pictures
John, left, and Robert hang out with dog Mo at the Hyannis Port compound in 1946. John, of course, went on to become President after serving in the Senate. Robert, aka Bobby, was a US senator and US attorney general who was assassinated while running for president in 1968.
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Photos: The Kennedy compound, in pictures
Edward, aka Ted, joins future first lady Jackie Bouvier for a game of baseball in 1953.
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Photos: The Kennedy compound, in pictures
John and Jackie Kennedy play with their daughter, Caroline, in 1959. He was elected President one year later.
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Photos: The Kennedy compound, in pictures
Caroline holds cats in the gardens of Hyannis Port in 1961.
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Photos: The Kennedy compound, in pictures
President Kennedy, right, walks with Defense Secretary Robert McNamara in 1961.
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Photos: The Kennedy compound, in pictures
First lady Jackie Kennedy and astronaut John Glenn do a little water skiing in Nantucket Sound in 1962.
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Photos: The Kennedy compound, in pictures
Ethel Kennedy sits with various Kennedy children in 1963, when the family was celebrating the christening of Bobby's son Chris.
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Photos: The Kennedy compound, in pictures
John and Jackie, joined by Caroline and John Jr., play with dogs in 1963.
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Photos: The Kennedy compound, in pictures
President Kennedy, left, swims with family and friends during a weekend in Hyannis Port in 1963.
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Photos: The Kennedy compound, in pictures
John Jr. takes the wheel of a speedboat during Labor Day weekend in 1963.
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Photos: The Kennedy compound, in pictures
A man in Hyannis Port glances outside a window to see Joseph Sr. being pushed in a wheelchair in 1964. Joseph Sr., a former US ambassador to the United Kingdom, died in 1969.
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Photos: The Kennedy compound, in pictures
Ted Kennedy soaks up the sun on a Hyannis Port breakwater in 1969. He became a US senator in 1962, and he held that office until his death in 2009.
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Photos: The Kennedy compound, in pictures
Rose Kennedy plays some golf on the family property.
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Eunice Kennedy Shriver addresses a group of women on behalf of her husband, Democratic presidential contender R. Sargent Shriver, in 1976.
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Photos: The Kennedy compound, in pictures
John Jr., second from left, hangs out with friends in Hyannis Port in 1980.
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Photos: The Kennedy compound, in pictures
Eunice is joined by her daughter Maria, right, and Maria's husband, actor Arnold Schwarzenegger, at the Kennedy compound in 1981.
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Photos: The Kennedy compound, in pictures
Ted Kennedy, left, and John Jr., right, join other family members for a football game in 1997.
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Photos: The Kennedy compound, in pictures
The flag at the compound flies at half-staff after the death of Ted Kennedy in 2009.
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Former US Rep. Patrick Kennedy, one of Ted's sons, walks with his wife, Amy, after their wedding in Hyannis Port in 2011.
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She had written about battling depression
Kennedy Hill attended a private high school in western Massachusetts. She wrote an opinion piece for the student newspaper about her struggles with depression.
"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 a column in the Deerfield Academy's student publication in February 2016. "Although I was mostly a happy child, I suffered bouts of deep sadness that felt like a heavy boulder on my chest."
The column focused on her return to school for her senior year after she took medical leave for treatment. She lamented, in part, that federal privacy law seemed to prevent her teachers and advisers from knowing what she was going through, and asserted that the school could be better prepared to talk about mental illness.
