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Naweet suffered injuries after being stoned and beaten by residents who were angered by the woman's killing.
Earlier, the court had heard that Naweet lured Ekaru to the disputed parcel and attacked her.
Mr Machua said he found the alleged murder weapon, a knife, in a thicket nearby. "We were told it was the knife used to stab the deceased," he said.
The officer said Naweet, who was represented by lawyer Hillary Sandi, was found unconscious after the mob beat him up and was taken to Isiolo Level Five hospital.
Part of gathering evidence was taking photos of the scene and the body.
Machua said there were also stab wounds on Ekaru's left leg, back, thighs, right forearm, between her thumb and forefinger.
She suffered the injuries on her hand as she tried to defend herself, the court heard.
Principal Prosecution Counsel Eric Masila told Justice Muriithi he had two more witnesses, an investigating officer and a government analyst.
Defenders Coalition lawyer Zaina Kombu said they were satisfied with the pace of the case, now that there were only two remaining witnesses.
Justice Muriithi set September 18 as the date for the hearing will resume.