He then hanged himself in their house in Pipeline, Nairobi perhaps to escape facing justice.
It is their son who discovered the bodies on Tuesday morning when his mother failed to come out of the bedroom to see him off to school.
Neighbours who responded to screams from the nine-year-old boy said they were shocked to see Kasasi’s body dangling from a rope tied to the ceiling in the house. The body of his wife Roseline Mwende who sold groceries in the nearby market lay in a pool of blood on the ground.
“It appears the bodies had stayed there for sometime, most likely hours,” a neighbour John Ombacho said, speculating that the killings may have occurred in the early hours of Monday night or midnight.
A kitchen knife soaked in blood lay beside the woman’s body.
Police officers who arrived at the scene from the nearby Embakasi police station declared it as murder and suicide cases.
“The Scenes of Crimes personnel have visited the scene and taken evidence for further investigations, but this is a clear case. The man murdered his wife and then committed suicide, that is the preliminary assessment we have from that scene,” Nairobi Provincial Police chief Moses Nyakwama said.
Bodies of the couple were taken to the City Mortuary.
Police said neighbours had informed them of numerous occasions when the couple quarreled.
Area police Chief Odhiambo Akelo said the killings may have occurred as a result of marital wrangles.
“They had been wrangling for a while, that is what the neighbours are saying,” Akelo said.
A police officer who visited the scene said the deceased man had attempted to commit suicide recently when he jumped from an upper floor but was not wounded.
The incident comes only two weeks after a 45-year-old man killed his five children before committing suicide following a domestic quarrel with his wife in Chepsirwa farm of Kuresoi district.