Mr Nyapara is accused of shooting dead his lover, Christine Maonga, who was a secondary school teacher at Navakholo Secondary School.
After the Thursday evening incident, Mr Nyapara fled leaving the murder weapon, a Ceska pistol, at the scene of crime.
Reports indicated that the two had been embroiled in domestic disputes for a long time, with the officer threatening to kill “someone”.
Police have arrested the suspected killer police officer who shot dead a secondary school teacher in Navakholo Sub-County in Kakamega on Thursday evening.
Western region police boss Rashid Yakub said Mr Patrick Nyapara was attempting to escape to Uganda when police nabbed him.
“Through joint operation of the security agencies, we managed to arrest Mr Nyapara while he was trying to cross to Uganda. He cooperated with the officers and he is under police custody,” said Mr Yakub.
He said the suspect will be arraigned on Monday to be charged with murder.
Mr Nyapara had allegedly shot to death Christine Maonga, a secondary school teacher at Navakholo Secondary School and with whom they he had a child.
Mr Wesisi, Maonga’s brother, said she had just been employed by the Teachers Service Commission after three years of working under the boards of management in various schools.
She had been posted to St Monica Buyofu Mixed Secondary School in Busia County.
Mr Fredrick Okumu, the father of Ms Maonga, denied that his daughter was married to the police officer who killed her.
He said he had never seen the man, who is said to be the father of his three-year-old granddaughter.
“In fact, he is not the father of this small girl, unless DNA is conducted to give proof. He has never shown any concern about her upkeep. Since she was born three years ago, it has become my responsibility to take care of her,” said Mr Okumu.