"The two have a child together. The man sent the money for upkeep but he was shocked when the woman sent back the cash," he said.
Mr Okeri said Ms Chepkemoi told the man that her father asked her to end their relationship.
"The man travelled to Bomet where the child was with the woman's parent and he was denied to access to his child and that's when he decided to come to Mombasa to follow up on the issue with the woman," said Mr Okeri.
After talking for two hours, an argument ensued and the man stabbed the woman.
Ms Chepkemoi was taken to Kilifi County Referral Hospital where she is receiving treatment.
The suspect is set to be arraigned on Monday.