The pathologist noted that Mwangi was hit on his head with a blunt object three times; his hands also had injuries.
His body was transferred from Machakos on Monday to Eldama Ravine for preservation, and the burial will be conducted on Wednesday.
Three people have been arrested in connection with the murder of the Maimahiu taxi driver, whose body was discovered in a thicket in Machakos County on May 5, a day after going missing.
The body of Samwel Njoroge Mwangi, 37, was discovered in a thicket in Kalama Sub County in Machakos County by residents who called the police.
