The usual morning buzz at Bishan Street 22 on Wednesday was interrupted by loud quarrelling, a yell and then a crash.
Tang Siong Beng, 40, allegedly stabbed his ex-girlfriend, a 39-year-old spa therapist from Malaysia, before falling to his death.
The incident happened at about 9am on Wednesday at the woman's rental flat on the 16th storey of Block 263.
Residents of the block told the Chinese evening papers Shin Min Daily News and Lianhe Wanbao that heated quarrels could be heard coming from the flat.
The quarrel that day progressed to a physical fight when Tang allegedly drew a fruit knife and stabbed the woman in the chest.
The victim managed to run out of the flat, her blouse soaked in blood, and then she fell.
Neighbours who saw her lying along the corridor called the police.
Tang is believed to have fallen from the kitchen window of the flat some time later.
Housewife Pamela Shee Toh, 51, a neighbour on the 18th storey, said she would occasionally hear shouting and quarrelling from neighbours in the block.
When The New Paper visited the victim's flat, a 69-year-old man opened the door.
The rag-and-bone man said he lived there with his sister and the victim, who had been a tenant for about a year.
'DIDN'T LIKE TALKING'
He told TNP in Mandarin: "She didn't like talking to people. She never spoke to me, only to my sister, about work."
The police and the Singapore Civil Defence Force (SCDF) received a call at about 9.20am about the incident.
When they arrived, they found a man lying motionless at the foot of the block. He was pronounced dead at the scene by paramedics.
The woman had superficial stab wounds to her chest and was taken by ambulance to Tan Tock Seng Hospital, where she is warded.
Police investigations are still ongoing.
This article was first published on October 15, 2016. Get The New Paper for more stories.