86-year-old George Martin was found in the basement of a house in the 2200-block of Campbell Street.
Firefighters rushed to the scene around 8:30 p.m. Tuesday and found Martin as they were battling the fire.
Detective said Martin had suffered multiple stab wounds before house was set on fire.
The body was sent Wednesday morning to the coroner's office for an autopsy report to determine the cause of death.
The house was not destroyed in the fire, but experienced damage in some parts of the home.
The State Marshal's Office is offering a reward for details regarding this case.