Ricardo Sales was found murdered in the same home on August 28. Sales' son Frederick Sales has been missing since that time and authorities fear that he may also be a murder victim.
Investigators will not confirm the identity of the body or the cause of death.
Efren Valdemoro, who is suspected of killing Ricardo Sales, was killed last week by CHP officers following a pursuit. The body of Cindy Tran, Valdemoro's girlfriend, was found in Valdemoro's vehicle.
Valdemoro is also a person of interest in the murders of Marcaria Smart and Segundina Allen in Vallejo. The women's decaying bodies were found in Allen's home, where Allen's husband Charles Rittenhouse was living at the time. Rittenhouse was arrested and jailed for having large amounts of explosives in the home but was released on Wednesday.