Nairobi County Police Commander Japheth Koome said that the suspect had taken the deceased, Ms Grace Kinyanjui, to the Karen Hospital alleging that she had shot herself in an attempted suicide.
Police officers rushed to the hospital but found that the woman had a gunshot wound, fresh stab wounds and her fingers were also broken.
The suspect, Mr Richard Alden 63, was arrested and taken back to her residence where police established that he was a licenced firearm holder.
“Our officers also found a spent cartridge in the house which has been taken for ballistic examination,” Mr Koome said.
“He has been arrested and will face murder charges once investigations are complete,” he added.
The suspect is a former CEO of Wananchi Group.
He had also served as the group’s chief operating officer.
From 1998 to 2009, the suspect was the Chief Executive Officer and a founding director of ONO, the largest cable television and telecommunications operator in Spain.
The fatal shooting comes just a week after another man shot dead his friend in Garden estate, Nairobi in what is believed to have been a crime of passion.
Mr Leonard Kanari is said to have committed the act when he found the deceased, Christopher Adagi Muganda, with his girlfriend, who has been identified as Ms Edna Kariuki, when he went to visit her in the wee hours of Saturday morning.
The woman was escorting the deceased from her house at 12.30am when they met the suspect who shot and killed the victim instantly.
According to Kasarani OCPD Robinson Mboloi, Mr Kanari who is a licensed firearm holder, shot the victim in the stomach with a pistol.