It all unfolded Saturday when officers responded to the home on The Strand to conduct a welfare check, according to the Hermosa Beach Police Department. A neighbor reported a foul odor coming from the property and the person that lived there hadn't been seen in days.
When officers arrived, they encountered a person inside who they say was not the tenant. That person refused to leave the home and indicated they were possibly armed.
That suspect, identified as 39-year-old Robert Simmons, was barricaded in the home for about seven hours. Simmons, according to investigators, originally told detectives their name is Elanor Beaulieu.
Dozens of residents and tourists were forced to evacuate the area for the duration of the standoff.
The suspect eventually exited the home and was arrested, with bail was set at $2 million.
When police searched the home, they discovered the dead victim, who has been identified as Demetrius Doukoullos, 92.
The medical examiner ruled the death as a homicide.
The relationship between the suspect and victim is not clear.