SAN JOSE — Homicide detectives are investigating the death of a woman reported at a West San Jose apartment complex over the weekend, according to the San Jose Police Department.

Officers were called about 7:30 a.m. Saturday to the Mosaic Apartments in the 500 block of Race Street, north of Parkmoor Avenue, and they arrived to discover a 30-year-old woman unresponsive inside a second-floor unit.

She was pronounced dead at the scene. Her identity was not immediately released pending notification of her relatives. Police say no public danger is posed by the death.

The death marks the city’s 23rd homicide of the year and 15th of the summer. There were 26 homicides recorded at the same point in 2014.

A man who lived in the apartment with the woman called 911 after waking up to find her unresponsive, according to a source familiar with the investigation. The source added that the man initially refused to allow police to search the residence, and investigators had to obtain a warrant.

Police announced Monday evening that they arrested a suspect and booked him into the Santa Clara County Jail on suspicion of murder. Police gave no other details about the arrest or the suspect.

But a source said the suspect was the same man who lived in the apartment.

The cause of the woman’s death has not been released pending results from an autopsy, and the circumstances remain under investigation. Further details were not immediately available.

Residents who live in the building where the killing occurred said they were ordered to shelter-in-place while police searched the complex, and eventually interviewed them. Multiple residents reported hearing arguing coming from the deceased woman’s unit the previous night.

As they watched firsthand a large police detail examining and processing the site for most of Saturday, residents were upset about how they were left in the dark about what had happened for the remainder of the weekend.

Emails sent from the apartment management to tenants over the course of the weekend progressed from describing it as an “incident” to a “death” and stated repeatedly that resident safety was not compromised. Residents were also asked to refrain from speculation on social media.