22-year-old Sawirse Kennedy Hill was the daughter of Courtney Kennedy Hill, one of 11 children of the late presidential candidate and Ethel Kennedy, an environmental and human rights activist.
Kennedy Hill had acute toxicity for methadone, diazepam, nordiazepam, fluoxetine, norfluoxetine and ethanol in her system at the time of death, according to toxicology findings disclosed in the death certificate.
Kennedy Hill was pronounced dead at Cape Cod Hospital at 3:14 p.m., according to her death certificate.
Communication College at Boston College, Kennedy Hill had to graduate next year, the college said after she died.
She volunteered in Mexico to build schools in local communities and was "displaced by human rights and women's empowerment," her family said in a statement released after her death.
" She lights our lives with her love, her pennies of laughter and her generous spirit, "the family statement said.
Kennedy Hill had previously written an opinion on her high school newspaper about her fight against depression.
" My depression took root early in my high school years and will be with me until the end of life yes, "she writes in a column in a student publication at the Deerfield Academy in February 201