A photograph, a location pin and words heard over the phone directed police to Xuan Zhang’s home early June 15.
SAN JOSE, Calif. — The first person outside a South San Jose home to understand that Xuan Zhang might be in mortal danger was a friend looking at a phone shortly after midnight.
The friend saw a photograph of Zhang injured on the floor and received a location pin, according to court records summarized by news organizations. She began calling, reached Zhang’s husband and heard Zhang ask for help in the background. Her decision to alert authorities sent officers to the Snell Avenue residence, where they found Zhang dead and arrested 55-year-old Shede Mao. The call is now a central part of a murder case built around what witnesses saw, heard and received during Zhang’s final known minutes.
Authorities have not publicly identified the friend, and the available reports differ on some details of how the photograph reached her. One account says Zhang called and texted the woman after the attack. Another says Mao sent images to friends. The distinction matters because it may establish who was operating each device at a particular moment. Investigators can use message records, timestamps, phone extractions and witness testimony to reconstruct that sequence, but those materials have not yet been tested at trial.
What is consistent across the reports is the friend’s immediate response. She repeatedly called Zhang’s and Mao’s phones. When Mao eventually answered, she could hear Zhang alive in the background, the records say. Zhang said “Help,” referred to Mao as her husband and asked for something to drink. Mao allegedly answered that he was not her husband. The friend then contacted 911 and provided the information available to her, including the location associated with the messages.
Police arrived at the home at about 12:45 a.m. June 15. Mao came outside as officers approached, according to investigators. Reports based on court records said he was covered in blood and carried his phone. Another account said he raised his hands before surrendering. Officers detained him and entered the residence, where they found Zhang on the floor near a bedroom door. She was pronounced dead at the scene.
The room contained evidence of extensive violence, authorities said. Blood was found on the carpet, the door, an adjoining wall and a ceiling light fixture. Officers recovered a large machete with a blood-stained blade and two dumbbell weights that also appeared to have blood on them. Published accounts of the court records said Zhang suffered blunt-force and sharp-force injuries. Police also documented injuries to her head, face and hand.
Prosecutors allege Mao caused those injuries and then used his phone to document Zhang as she lay on the ground. A forensic review reportedly uncovered two photographs and two video recordings made after the attack. The recordings have not been released publicly. Their evidentiary importance may depend on technical details such as when they were created, whether they were edited, how investigators preserved them and whether they show anything that directly identifies the person behind the camera.
A friend of Mao also told investigators that Mao sent a photograph showing Zhang’s injured body and a message saying his wife was badly beaten, according to the Santa Clara County District Attorney’s Office. It is not clear from the public record whether that witness and the woman who called 911 were the same person. Prosecutors may rely on both accounts, along with carrier data or device records, to explain how the alarm spread beyond the house.
The friend’s role does not make her a neutral recording device. Like any witness, she will likely be asked to explain what she received, what she heard, how she recognized the voices and why she understood the situation as an emergency. The defense may test her memory and the consistency of her account. Those questions are a normal part of an adversarial trial and do not diminish the importance of the emergency action she took that night.
Investigators say the events followed months of worsening conflict between Zhang and Mao. A roommate and co-worker reported seeing them arguing at a shopping center on the evening before Zhang died. Court records described the couple as standing close together during the dispute. No physical attack was reported at the shopping center, and authorities have not released surveillance video or a full witness statement from that encounter.
Zhang had told Mao that she wanted a divorce during an earlier dispute, according to investigators. Her son later told detectives that he had witnessed domestic violence between the couple that was not reported to police. The San Francisco Chronicle reported that Zhang had described being choked by Mao in December 2025. Because the alleged incident was not adjudicated in an earlier criminal case, it remains a witness account that prosecutors would need to support and present under applicable evidence rules.
The couple had married in China about a decade earlier and moved to the Bay Area in October 2025, according to published reporting based on case records. Authorities have not said whether Zhang had filed a divorce petition, obtained a protective order or contacted a domestic violence organization. They also have not released a full history of calls for service at the residence. Her expressed desire to divorce is part of the alleged background, not proof by itself of who committed the killing.
Mao is charged with murder, and some reports have identified the accusation as first-degree murder. Prosecutors must prove more than the fact that he was present at the home. They must establish that he caused Zhang’s death and acted with the mental state required for the charged offense. Evidence of weapons, blood, injuries, phone files and communications may be used to build that case, but each item must be authenticated and admitted through lawful procedures.
The defense will be entitled to review the police reports, forensic testing and phone extraction. Lawyers could dispute the accuracy of the government’s timeline, the interpretation of a message or the meaning of a recording. They may also examine whether another person had access to a phone or whether the condition of the scene supports a different account. No defense theory has been publicly detailed, and Mao’s silence outside court cannot be treated as evidence of guilt.
The friend’s call may also help fix the timing of Zhang’s condition. If the phone records establish when she spoke, when the image was sent and when officers arrived, prosecutors could use that narrow timeline to compare the communications with forensic findings. The medical examiner’s conclusions, including the cause and approximate time of death, will be important. A complete autopsy report has not been made public in the cited reporting.
Zhang’s killing was the fourth domestic violence homicide reported in San Jose during 2026, according to the District Attorney’s Office. Prosecutors announced Mao’s charge during a week when they also filed a separate murder case against a man accused of killing another estranged wife. A third woman had been critically injured in a domestic violence-related shooting at a medical office building days earlier. Those other incidents provide community context but are not evidence against Mao.
The legal proceedings will determine how much of the emergency communication reaches a jury. A judge may be asked to consider whether particular statements qualify under exceptions to hearsay rules, whether the phone search complied with constitutional requirements and whether photographs or recordings are more probative than unfairly prejudicial. Such rulings can shape a trial without deciding the ultimate question of guilt.
Mao has remained in custody without bail, according to published court information. He was reported to be due back in court July 30 for a plea hearing. Zhang’s friend, whose calls brought police to the home, may eventually become a key witness. For now, the public record shows that her attention to a photograph, a location and a voice provided the first outside account of the emergency that became Zhang’s death investigation.
Author note: Last updated July 18, 2026.