Tragedy struck this morning at a condominium unit at Q Bay Residences in Tampines St 86.
A woman is believed to have stabbed her husband multiple times before leaping to her death from the unit.
The incident took place at about 5.45am.
Before that, neighbours say they heard the couple quarrelling, reportedly over marital issues.
The couple, both 35 years old, are reportedly Filipinos and have a 14 year old daughter.
Police discovered the husband in the unit dazed and bleeding.
He was sent to Changi General Hospital for treatment.
His wife was found dead at the foot of the condominium block.
Investigations are ongoing.