A 38-year-old woman jumped to her death with her 10-year-old son from a flat in Tuen Mun.
The boy had been living with his father since his parents broke up seven years ago.
The mother, surnamed Chung, visited him on Sunday and stayed overnight in the 30th floor Kin Lung House apartment in Lung Yat Estate.
They had breakfast together but were nowhere to be found when the father checked on them after a shower, according to Ming Pao Daily.
Firemen later found their bodies on a first floor podium.
It was the second family tragedy in 10 days after a distraught father plied his sons with rat poison before killing himself in their Kam Ying Court flat in Ma On Shan.
Police are treating the latest incident as suicide.
They are investigating whether the child, a fifth-grader at Tung Wah Group of Hospital’s Tang Shiu Kin Primary School, had been drugged.
Chung left a will but did not say why she wanted to die with her son. She was apparently depressed, according to investigators.
A spokesman from the Social Welfare Department urged parents in trouble to seek help.
The Samaritans, a non-religious charity, runs a 24-hour multilingual suicide prevention hotline (+852 2896-0000).
Also, it can be reached by email at email@example.com.
Dr. Jessica Ho, director of Against Child Abuse, a non-government child protection agency, said people should think twice before going to extremes.
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