Though the exact term of the womanâ€™s pregnancy wasnâ€™t immediately ascertained, police say she was in her last trimester (between 7 and 9 months of pregnancy).
Police are yet to be establish why Mutiso killed his lover, though it is suspected the two had protracted relationship problems.
Residents familiar with the coupleâ€™s relationship said the loversâ€™ affair got turbulent the moment the 27-year-old woman got pregnant.
â€śThey would argue time and again, and at one point they even lived separately before reuniting again,â€ť the pairâ€™s neighbour told reporters.
Both the suspect and the victim worked at Makutano hotel in Mutituni Market.
A single yelp by the victim caught the attention of other passersby, who rushed to the scene and found the victim lying on the ground with blood gushing from her chest.
â€śShe had been stabbed in the right side of her chest, and in the back,â€ť said a witness.
Attempts to chase the suspect bore no fruit as he outran his pursuers.
In the last two months, the lovers were not staying together in the same house, though they shared a compound.
â€śThe man rented a house adjacent to his girlfriendâ€™s,â€ť said a neighbour.
The victimâ€™s body was taken from the scene at 9am and taken to Machakos Level 5 Hospital morgue. The knife that the suspect used in killing his lover was also found at the scene.
Machakos County Police Commander, Karanja Muiruri, Karanja told reporters that a search for the suspect is ongoing.
â€śWe do not know where he ran to, but one thing weâ€™re sure of, is that weâ€™ll catch him,â€ť said Karanja.
The incident drew anger in residents whom we spoke to, with all calling for the arrest and prosecution of Mutiso, whom they termed as a â€śnon-native of Mutitini areaâ€ť.
â€śAs a parent, I am highly disappointed by what the young man did. Violence should not be an option when it comes to resolving relationship issues. His action forced us to close shop and leave for our homes; it was so horrifying and unfortunate,â€ť said Ruth Mutala, a trader at Mutituni Market.
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