Vallejo police arrested a Brentwood man early Sunday on the suspicion of abusing an elderly man under his care.
Police responded to reports of a man banging on doors and asking to be let in the 600 block of Alabama Street at about 3:10 a.m.
Arriving officers saw the man on the ground, unresponsive but breathing.
"The man had defecated and urinated himself," police said.
Paramedics were asked to attend to the man, police added.
As officers were investigating the incident, a man showed up at the scene. Police soon determined that the man was a caregiver of the victim, a 69-year-old "extremely dependent adult," police said.
The caregiver, identified as Oleander Harrison, 40, drove to Vallejo from Brentwood with the victim to visit the suspect's girlfriend. As he was visiting, Harrison allegedly left the victim in the car for many hours.
Harrison was arrested and booked into Solano County jail.