Thai Princess Bajrakitiyabha Mahidol, the king’s eldest daughter, has died aged 47, the royal palace has announced, more than three years after she was hospitalised following a sudden illness.

The princess was hospitalised in December 2022 after a sudden loss of consciousness caused by a heart condition while visiting the northeastern province of Nakhon Ratchasima.

Ms Bajrakitiyabha was flown by helicopter to the capital Bangkok for treatment.

She died yesterday evening, after her condition worsened due to an intra-abdominal infection, colitis, low blood pressure, arrhythmias, and blood clotting disorders, the palace statement said.

Ms Bajrakitiyabha, popularly ‌known as Princess Pa, was ⁠born on 7 December 1978, to the then Crown Prince Vajiralongkorn and his first wife, Princess Soamsawali.

In Thailand, she will be remembered for her prominent role in public life, her efforts to improve the livelihoods of female prisoners, and her diplomatic career.

She studied law at Cornell University, obtaining a Master’s degree ‌and a Doctorate, and worked as an attorney in the Thai Office of the Attorney-General between 2006 and 2011.

From 2012 to ⁠2014, she was Thailand’s ambassador to Austria, Slovenia and Slovakia, before returning to the attorney-general’s ‌office in Bangkok.

Officials pay their respects in front of a picture of Thailand's Princess Bajrakitiyabha as she has been hospitalized due to a heart condition at Chulalongkorn hospital on December 16, 2022, in Bangkok, Thailand. (Photo by Vachira Vachira/NurPhoto via Getty Images)
Officials pay their respects in front of a picture of Princess Bajrakitiyabha after she was hospitalised

She also founded a charity promoting the rights of ⁠female inmates, particularly those ‌who were pregnant while in jail.

In 2017, the princess was appointed as the goodwill ambassador for the rule of law in Southeast Asia by the United Nations Commission on Crime Prevention and Criminal Justice.

She transferred ⁠to the army in 2021, where she was bestowed the rank of a general and served ⁠as a chief of staff in the Royal Security Command.

The princess was one of King Vajiralongkorn’s three children who have formal titles and are eligible to take the throne under the constitution.

In October last year, Thailand’s Queen Mother passed away at 93.

The palace will hold royal funeral rites, while the government is expected to declare a period of ‌national mourning.