Hulu Selangor district police chief Supt Norel Azmi Yahya Affandi said Woo Wian Kian, 36, was believed to have killed her daughter before committing suicide based on the note left by her on a table in the hotel room.

"In the note, Wian Kian wrote, 'I can no longer go on with this life. Thank you to you, as a husband and for elder sister, mother is old, take good care of her'," he said through SMS to the media today.

Norel Azmi said during inspection at the scene, police found ash from burnt paper and charcoal in the bathroom of the hotel room where Woo had stayed with her daughter.

"Based on the initial investigation, the ventilation openings of the bathroom were covered with newspapers. We believe she (Woo) had locked her daughter in the bathroom until the child suffocated in the smoke.

"She is believed to then place her lifeless daughter on the bed before killing herself," he said, adding that dark ash marks were found on the soles of their feet.

He said at this point, police had classified the cases as sudden deaths and the bodies of the mother and daughter were sent to Sungai Buloh Hospital.