A man and a woman were found dead in related cases at Tampines Central 8 late on Monday night.
A 49-year-old man was found lying motionless at the foot of Block 520A, while the body of a 46-year-old woman was later found in the bedroom of a 10th-floor unit in the same block.
The woman, believed to be Miss Serinn Tan Bee Leng, and the man, understood to be Mr Chng Hong Nam, were pronounced dead by paramedics at the scene.
Police are investigating the unnatural deaths. A police spokesman said they were alerted to the incident on Monday at about 11pm.
The duo were not married and The Straits Times understands that the man was not living at the three-room flat in Tampines.
He was believed to have died from a fall from height, and ST understands that the woman had stab wounds.
Police officers were seen back at the scene yesterday at about 1.15pm, searching the bushes around the block. ST understands they were searching for a knife.
They also recovered cable ties from the grass patch and logged them as evidence.
Neighbours said they heard a commotion in the wee hours of yesterday morning, but did not know the woman who owned the unit.
IT consultant Foo Thong Seng, 30, was heading to bed about 1am when he heard screams coming from the foot of the block.
He looked out of the window and saw a blue tent on the grass patch downstairs and two men and two women. One of the men, who looked to be in his 20s, was screaming and running around the block.
Mr Foo said: "He was hysterical and there were a lot of police officers around them. Some officers were searching the drains and bushes with torchlights."
When ST visited the dead man's home in Pasir Ris yesterday afternoon, his family declined to comment. An elderly woman, believed to be the man's mother, was heard crying loudly at the wake set up at the void deck.
Earlier this month, there was a pair of unnatural deaths in Marsiling Lane.
In that case, a 59-year-old man was discovered at the bottom of a block of flats, while a 31-year-old woman was found in his residential unit in the block opposite.