Police say the 24-year-old Mountain View woman was found shot to death in her car in January, and two arrests followed two months later.
SUNNYVALE, CA — A Sunnyvale man identified by police as the father of a 5-year-old boy and a second man from Hollister have been charged in the fatal shooting of a young mother found inside her car at a Sunnyvale mobile home park, authorities said this week.
Kembery Chirinos-Flores, 24, of Mountain View, was found with gunshot wounds shortly before 9:40 p.m. on Jan. 7 near 1225 Vienna Drive, inside the Plaza del Rey mobile home park, police said. The arrests matter because they mark the first public break in a homicide investigation that had gone unsolved for two months and because investigators say the victim left behind a young son. Officials say both suspects are now in Santa Clara County custody while detectives continue to sort out how the killing happened and who fired the fatal shots.
Sunnyvale Department of Public Safety officers were sent to Vienna Drive at about 9:39 p.m. after a report of a shooting, according to the city’s initial and follow-up statements. When they arrived, they found Chirinos-Flores inside a vehicle with gunshot wounds. She was pronounced dead at the scene. Police said the shooter or shooters had already fled. For weeks, public details were thin. Investigators released the basic timeline, confirmed the case was being handled as a homicide and asked anyone with information to contact Detective Eugene Rosette. Then, on March 5, detectives carried out coordinated arrests in two counties. Police said Gerzon Chirinos, also known as Gerzon Chirinos-Munguia, was arrested in Sunnyvale, while Alfonso Inestroza, also known as Franquin Inestroza-Martinez, was arrested in Hollister. Both were taken into custody without incident, Chief of Public Safety Dan Pistor said.
Authorities have identified Chirinos as the victim’s former partner and the father of her child. Police said the two shared a 5-year-old son. Investigators also said Chirinos had a prior domestic violence-related offense involving a different victim in 2018, though they have not publicly tied that earlier case to the January killing. Inestroza, police said, was already wanted on an unrelated murder warrant from New Jersey at the time of his arrest in California. In their public briefing and written release, Sunnyvale officials said both men were booked into the Santa Clara County jail on murder charges. Police also said a shotgun believed to be the murder weapon has been recovered. Even so, investigators have not said which of the two men is accused of firing the gun, whether both are alleged to have been at the car when the shots were fired, or what evidence directly places each suspect at the scene. Those unanswered questions remain central to the case as it moves forward.
The location of the killing also sharpened the shock in a city that rarely sees this kind of violence. Plaza del Rey is a large mobile home park in Sunnyvale, and police described the attack as a rare act of violence in one of the safer cities in the region. The first public notice after the shooting gave no suspect description, no motive and no explanation of why Chirinos-Flores was at Vienna Drive that night. Later reporting added that she was found in her vehicle near the mobile home community and that the investigation stretched across Santa Clara and Monterey counties before the arrests were made. In public remarks, Pistor described Chirinos-Flores as a young mother working two jobs to support her family. That detail, repeated in several local accounts, gave the case a human center beyond the crime scene and the charging paperwork. It also underscored the loss left behind for her son and relatives, who waited through two months with no announced arrest.
What happens next is likely to turn on charging documents, jail records, court filings and any additional evidence prosecutors choose to describe in open court. So far, the public record shows only the broadest outline: two men were arrested March 5, both were booked on murder charges, and the investigation remains active. Police have not publicly released a detailed probable cause statement, a clear motive, or a breakdown of each suspect’s alleged role. They have also not said whether more charges could follow, whether gang allegations, firearm enhancements or conspiracy counts are being considered, or whether any surveillance video, phone records or witness statements helped lead detectives to the two men. Officials have said there is no ongoing threat to the community. They have also said the child was not harmed in the shooting and is now in the custody of Child Protective Services. Any arraignment dates, plea entries or future hearings are expected to provide the next formal look at the prosecution’s case.
The public language from investigators has been restrained but pointed. “These arrests represent an important step toward justice for Kembery and her family,” Pistor said in the city’s March 9 release announcing the arrests. At a separate briefing, he said Chirinos-Flores “was in the prime of her life” and called the killing a “tragic and senseless act of violence.” Those statements, though brief, reflected the tone police have taken since the arrests: relief that two suspects are in custody, but caution about discussing facts that have not yet been aired in court. The department also credited a wide group of agencies for helping close in on the suspects, including the Santa Clara County District Attorney’s Office, the FBI, Hollister police, the Monterey County Sheriff’s Office and specialized enforcement teams in Santa Clara and San Benito counties. That list suggests detectives spent weeks tracing movements or evidence beyond Sunnyvale before moving in.
For now, the case stands at a charged-but-still-developing stage. A 24-year-old mother is dead, two men are jailed, a weapon has been recovered, and detectives say the work is not finished. The next major milestone is expected to come in Santa Clara County court, where prosecutors should begin laying out the allegations in fuller detail.
Author note: Last updated March 11, 2026.