Malaysia's former Prime Minister Mahathir Mohamad was admitted to a hospital following the death of his wife, state media reported on Wednesday.

Mahathir was admitted to the National Heart Institute (IJN) for observation on Tuesday, Bernama news agency cited his son Mukhriz Mahathir as saying.

The 101-year-old statesman was admitted a day after the death of his wife, Siti Hasmah Mohd Ali, at the same hospital.

Siti Hasmah died on Monday at IJN at the age of 100 after her condition deteriorated following a heart attack and was laid to rest later that day.

Mahathir and Siti Hasmah, both doctors by training, were married for 70 years and had seven children.