OAKLAND -- The death of a Las Vegas man whose body was found in August inside a West Oakland house has been ruled a homicide by the coroner's office, police said Monday.

Investigators would not release the exact cause of death of Peirri Leonard, 55, which was ruled a homicide last week. There were no visible signs of trauma to his body when he was found, police said.

Leonard was found Aug. 8 in the house in the 1700 block of Filbert Street. He had been in Oakland about a week before his death, police said.

Although he was living in Las Vegas, police said Leonard has family in Oakland as well as friends. Police would not say why he might have been at the house.

Officer Rob Rosin said police don't have a motive yet for the killing and no arrests have been made.

Rosin said "somebody knows what happened to Mr. Leonard and we would like the community to come forward and help us solve this case."

The death brings the number of homicides in Oakland so far this year to 120, which is 10 more than all of last year.

Police and Crime Stoppers of Oakland are offering up to $10,000 in reward money for information leading to the arrest of the killer. Anyone with information may call police at 510-238-3821 or a tip line at 510-773-2805 or Crime Stoppers at 510-777-8572.