Pamela Burns, president and CEO of the Hawaiian Humane Society, died at her home Monday night. She was 65-years-old.

Burns had been on a leave of absence for health reasons at the time of her death, according to an announcement today from the Humane Society.

“We are all shocked and deeply saddened by this loss,” said Bob Armstrong, the Humane Society’s board chairman. “Pam’s passion to improve the lives of both the animals and people of Hawaii was unmatched. She was a leader in the national and international animal welfare movement, the guiding force for the Hawaiian Humane Society for the past 27 years and a treasure in our community… The board, leadership team and staff are committed to carrying on Pam’s legacy by fulfilling the mission and continuing the essential work of the society.”

Burns served as president and CEO of the Hawaiian Humane Society since 1990. During her time at the society, the organization reduced euthanasia, increased adoptions and strengthened prevention and education programs.

She also served as the chairwoman of the National Council on Pet Population. She was a member of Petco’s Independent Animal Care Advisory Council and the Hawaii Association of Animal Welfare Agencies. She also had previously held the position of president of the Society of Animal Welfare Administrators.

The Hawaiian Humane Society said plans to celebrate Burns’ life are pending.