Princess Bajrakitiyabha Mahidol, a lawyer, diplomat and one of Thailand's most prominent voices on criminal-justice reform, has died at 47, the royal household announced. She had been under hospital care since collapsing in December 2022 and never regained full consciousness.
The Bureau of the Royal Household said in a statement that she died Thursday evening at a Bangkok hospital where she had been treated since falling unconscious nearly three years earlier, according to The Associated Press. The palace did not immediately release a public schedule for mourning or funeral rites.
A Champion of Prison Reform
Throughout her career the princess focused on improving conditions for women behind bars, launching the Kamlangjai, or "Inspire," project to provide healthcare, training and support for incarcerated women preparing to reenter society. Her work helped drive Thailand's push at the United Nations that led to adoption of the so-called Bangkok Rules on the treatment of women prisoners, according to the Thailand Institute of Justice.
Cornell and the Law
Bajrakitiyabha trained as a lawyer at Thammasat University before earning an LL.M. and a J.S.D. at Cornell University, where the law school later established scholarships and an exchange program in her name. Her academic work, including a dissertation on protections for the accused, underpinned years of service as a prosecutor, diplomat and public figure advocating rule-of-law reforms.
Illness and Hospital Care
She collapsed in December 2022 while training dogs for an army exhibition and was rushed to a Bangkok hospital. Palace updates in 2026 said her condition had deteriorated because of multiple infections that medical teams struggled to contain, and doctors deployed supportive equipment as her heart rate became irregular, as reported by Bloomberg.
Monarchy and Succession
Bajrakitiyabha was the eldest child of King Maha Vajiralongkorn, and her extensive public service had prompted speculation that she might hold a key state role in the future. Thailand's male-preference succession, however, leaves Prince Dipangkorn as the presumptive heir. The palace previously said she had a mycoplasma infection, and the household confirmed she is survived by her parents and siblings, according to The Associated Press.
Legacy
Her mix of courtroom experience, diplomacy and human-rights advocacy left a record that extends well beyond royal ceremony: the Kamlangjai project, United Nations partnerships and scholarships that continue to send Thai students abroad. Cornell notes that the programs in her name and the Bangkok Rules she helped champion are expected to remain reference points for prison policy and legal education in the region.
