Investigators believe the body is that of 80-year-old Edward Clayton Andrews who disappeared in May.
Photos of a suspect were released from ATMs of someone using Andrews's bank card. That person removed over $130,000.
Thomas Jeffrey Brooks, 39, was arrested and charged with Andrews' murder last month. He is being held in Riverside.
Police said Brooks was a close friend and was often a caregiver for the missing Hemet man.
The concrete egg was discovered last Friday as a resident in San Diego tried to break up and remove the structure he said Brooks left on his property.
"When the residents in San Diego saw this egg-shaped concrete figure, they figured that their landscaper, which was the suspect, had made for them. They didn't like it. They began to destroy it. As they began to tear away the concrete and the wire, they noticed - in the center - there was wrapped in plastic ... and they came upon the body," said a spokesperson from the Riverside County Sheriff's Department.
Authorities are convinced the remains are those of Andrews. Authorities believe the victim had died from asphyxiation. They are awaiting DNA confirmation.
If convicted Thomas Brooks could spend the rest of his life in prison.
Due to the special circumstances, it may be considered a death penalty case.
Brooks will be arraigned on the Sept. 24.