Authorities initially disclosed no motive for four killings in a burning home; prosecutors now say the attack followed a breakup.
LANCASTER, Calif. — When four people were found shot in a burning Lancaster home in November 2024, investigators described an isolated attack but publicly offered no motive. Twenty-one months later, Miguel Diego Sandoval pleaded guilty to four first-degree murders, and prosecutors supplied the explanation missing from the earliest accounts: They say he attacked the household in revenge after the end of a romantic relationship.
The shift from an unexplained crime scene to an admitted criminal case shows how the official account developed as investigators and prosecutors gathered evidence. Authorities now say Sandoval waited outside the North Tabler Avenue residence until its occupants had gone to bed, entered and killed Janvi Maquindang, Christine Aca-ac, Edwin Garcia and Matthew Montebello. He then set the residence on fire and fled, according to the Los Angeles County District Attorney’s Office. A 16-year-old inside the home called 911 and was rescued from a locked bedroom. Sandoval is scheduled for sentencing Nov. 17 and is expected to spend the rest of his life in prison without parole.
The first public phase of the case contained far fewer answers. Deputies and firefighters were sent to the 44500 block of North Tabler Avenue at about 1:27 a.m. on Nov. 16, 2024. The one-story house was on fire. Authorities found four adults suffering from gunshot wounds. Three were pronounced dead at the scene, while a fourth was transported to a hospital and later died. The teenage survivor was not physically injured. At the time, investigators said they believed the violence was isolated, a statement that helped address concern about an ongoing threat but did not explain who had targeted the home or why.
Several days later, investigators arrested Sandoval, then 19 and also from Lancaster. The arrest narrowed the case to a named suspect but still did not produce a publicly announced motive. News reports at the time said homicide detectives had arrested him on suspicion of four murders and planned to present the case to prosecutors. Relatives of the victims said they were trying to understand the connection. Montebello’s mother said she recognized Sandoval’s name because of his relationship with a younger sibling in the household but had never met him. Law enforcement still described the motive as under investigation.
The next major change came Nov. 26, when the District Attorney’s Office formally charged Sandoval. Prosecutors alleged four murders, first-degree residential burglary and arson of an inhabited structure or property. They also alleged special circumstances involving multiple murders and lying in wait and said a handgun had been used. The charging announcement went further than the arrest reports by alleging that Sandoval entered while the victims were sleeping and set the house on fire after the shootings. Still, that announcement did not publicly describe the breakup-revenge theory that would later become part of the prosecution’s account.
During that period, the human picture of the household became clearer through relatives rather than court filings. Aca-ac and her fiancé, Garcia, lived with Aca-ac’s brother Maquindang and his partner, Montebello. Relatives said Aca-ac was also the legal guardian of younger siblings. Garcia’s family described him as a loving person who was attentive to others and made people feel included. Montebello’s mother remembered her son as gentle, smart and creative and said she had eaten dinner with him the night before his death. Neighbors described the two couples as quiet residents who mostly kept to themselves.
By the time Sandoval entered guilty pleas Aug. 13, 2026, the scope of the criminal case had grown. He admitted four counts of first-degree murder with special circumstances of multiple murders and murder by lying in wait. He also pleaded guilty to attempted murder, first-degree residential burglary and arson of an inhabited structure or property. His admissions included three felony animal-cruelty counts tied to three dogs that died in the fire and two felony child-abuse counts under circumstances likely to cause great bodily injury or death. The public plea summary did not explain every additional count in detail, but the broader list reflects the danger to surviving people and animals in the house.
The District Attorney’s Office also disclosed a more developed chronology. Prosecutors said Sandoval did not simply arrive at the home and immediately enter. He waited outside until the occupants went to bed, conduct that corresponds with the lying-in-wait special circumstance he admitted. He then went inside and fatally shot the four adults before starting the fire. The office said he acted as revenge after the breakup with Aca-ac and Maquindang’s brother. That account transformed the motive from an unanswered question in the 2024 investigation into an asserted factual basis accompanying Sandoval’s guilty pleas.
Sandoval’s pleas also change how the central facts can be described legally. In 2024, the government’s statements were allegations against a defendant presumed innocent unless proven guilty. Prosecutors had the burden of establishing the charges at trial. The August 2026 pleas removed that dispute over criminal responsibility for the offenses admitted. The remaining hearing is sentencing. District Attorney Nathan J. Hochman said the plea ensures a lifetime prison term and described the killings as calculated violence stemming from the failed relationship. Court reporting has said Sandoval faces four consecutive life terms without the possibility of parole.
Not every detail in the public record fits neatly together. Official statements and news reports issued at different times listed conflicting ages for several victims. The District Attorney’s August 2026 announcement identified Maquindang as 21, Aca-ac as 25, Garcia as 24 and Montebello as 21. Earlier government material listed older ages for some victims, and individual news reports also differed. The identities themselves have not been in dispute. Using the latest prosecution announcement avoids treating early biographical information as more settled than the record supports.
Other questions remain outside the limited public narrative. Prosecutors have not released a full evidentiary account explaining precisely how investigators reconstructed Sandoval’s waiting period outside the house, nor does the plea announcement detail the evidence behind every attempted-murder and child-abuse count. Authorities also have not made the surviving minor a public figure in the case. What is established by the guilty pleas is the set of crimes Sandoval admitted and the prosecution’s description of the overall sequence leading to them.
The case is being handled by Deputy District Attorney Alexander Bott of the Major Crimes Division and was investigated by the Los Angeles County Sheriff’s Department. The District Attorney’s Office lists the current prosecution as case 25CJCF02868. Sandoval’s sentencing is scheduled in Department 105 of the Foltz Criminal Justice Center. Unless the schedule changes, the Nov. 17 hearing will convert the guilty pleas into a formal judgment and sentence, ending the principal trial-court phase without a murder trial.
For the families, that legal resolution arrives long after the earliest unanswered questions. In November 2024, relatives knew four members of an interconnected household were dead, a teenager had survived a burning home and a young man had been arrested. By August 2026, Sandoval had admitted the killings and associated crimes, and prosecutors had publicly identified revenge after a breakup as the reason for the attack. Sentencing remains ahead, but the central legal uncertainty that defined the case at its beginning is no longer present.
Author note: Last updated September 28, 2026.