On Sept. 1 at about 4:10 p.m., officers responded to the 700 block of Carmelita Drive because neighbors and co-workers of Mark Hafen said they had not seen or heard from him since the night of Aug. 27.
Officers gained entry into Hafen's residence through an open window and discovered Hafen's body, police said.
An investigation of Hafen's cause of death pointed to head trauma, and the case was being investigated as a homicide, police said.
An autopsy was scheduled for Friday morning, although police have not released any information on Hafen's exact cause of death.
Detectives learned the last person seen with Hafen was Verginia Turner, 42, who was also allegedly the last person to visit the Carmelita Drive home.
Turner and Hafen had an on-again, off-again relationship, but she lived elsewhere, police said.
Police were actively looking for Turner, and on Thursday her family members brought her to the police department, where she was questioned and subsequently arrested on suspicion of murder, police said.
The case has been passed to the Monterey County district attorney's office, which will handled future inquiries.