Raila, who was undergoing treatment in India, is said to have died after suffering a cardiac arrest during a morning walk on Wednesday, October 15.
He was rushed to hospital where he was pronounced dead at around 9:52am (Indian time), according to a spokesperson for the hospital.
According to reports from India, his daughter and relatives were with him.
Raila had arrived at Koothattukulam in Kerala’s Ernakulam district for Ayurvedic treatment.
The 80-year-old had arrived in India six days ago for treatment, attracting nationwide attention as conflicting reports on his health began circulating.