Officers found the body of 74-year-old Donald Watson inside his home in the 4400 block of Regis Avenue shortly after 10 a.m. on Monday.
Investigators initially treated the case as a suspicious death, but said Tuesday they developed new information confirming Watson was murdered. They did not release a cause of death.
No charges have been filed.
Anyone with information is asked to call Investigator West at (919) 560-4440, ext. 29341 or CrimeStoppers at (919) 683-1200. CrimeStoppers pays cash rewards for information leading to arrests in felony cases and callers never have to identify themselves.