Their older sister told a court that years of restraining orders and alleged forgery came before a stranger was killed near a Cerritos park.
LA PALMA, Calif. — A dispute over an older woman’s home, finances and care escalated across a decade before two of her adult children were accused of killing a stranger and discussing attacks on relatives, testimony in a Los Angeles County murder case shows.
The family history has become an important part of the prosecution against Cindy Kim, 59, and John Chong Moon, 55. Their older sister said she repeatedly tried to protect their mother from the pair and stop them from taking control of the house. Prosecutors now say writings recovered after the defendants’ arrests reveal plans to remove the sister, her family and a neighbor who stood between Moon and Kim and the property they viewed as their final source of wealth.
The older sister described a conflict that existed well before the charged homicide. She testified that she obtained restraining orders in 2016 and again in 2022 to protect the siblings’ mother. She believed Moon and Kim were exploiting the older woman financially, according to accounts of the preliminary hearing. The sister also accused them of forging their mother’s signature on a deed-transfer document. The paper allegedly shifted an interest in the home to Moon and Kim without valid consent. Moon later tried to advertise the property for sale on Craigslist, the sister said. Public reports do not say whether anyone responded to the listing, whether money changed hands or whether the disputed document was formally recorded. The testimony nevertheless gave prosecutors a long-term explanation for hostility later found in the defendants’ notebooks.
The writings allegedly portrayed the house as more than a place to live. Moon complained that he and Kim had to struggle to afford a studio or one-bedroom apartment while their mother enjoyed a comfortable life, Detective Yoon Nam testified. Another entry called the property their “last bastion” of wealth and discussed forcing their mother to sell it “by any means necessary.” The entries mixed financial resentment with language about eliminating obstacles, according to prosecutors. Kim allegedly wrote in November 2024 about ordering a firearm to bring down members of the family. A December note said bullets had been stolen from a Sportsman’s store. Authorities have not disclosed the complete notebooks, and isolated lines may become the subject of disputes over context, authorship and meaning.
The sister and her household were not the only alleged targets. Investigators said one of the mother’s neighbors also appeared in the writings. News accounts of the hearing have not explained what the neighbor had done, why the defendants allegedly viewed that person as a threat or whether the neighbor knew about the references before the arrests. No attack against the family or neighbor has been reported. Prosecutors are using the entries to support a conspiracy allegation, but they must still show that Moon and Kim reached an agreement and took action that advanced it. Defense lawyers may argue that angry notes, even disturbing ones, did not amount to an executable plan. The legal difference between resentment and conspiracy is likely to shape later hearings.
By early 2025, Moon and Kim were living in a Toyota Prius, authorities said. Prosecutors contend that the siblings wanted a larger vehicle in which they could sleep and began searching for either a Honda Pilot or a Toyota 4Runner. That effort carried them away from the family home dispute and toward Don Knabe Community Regional Park in Cerritos on Feb. 25, 2025. At about 12:30 p.m., Cuauhtemoc Garcia, 66, arrived in a Toyota 4Runner for a walk along the Coyote Creek Bike Path. Investigators say the siblings noticed the SUV and followed Garcia after he left it. They allegedly confronted him with a gun and demanded the keys. When Garcia refused, Moon allegedly shot him. Garcia had no known role in the family dispute and appears to have encountered the pair by chance.
A witness reported seeing two people move Garcia’s body toward a dirt embankment. The defendants did not leave in his 4Runner, and the killing generated a search for two unidentified suspects recorded near the park. Surveillance cameras provided images, but investigators initially did not have names. The Sheriff’s Department released the pictures and requested public help. A tipster recognized the two people as the man and woman seen in a viral TikTok video recorded during a confrontation at a Panera Bread restaurant. The video, reportedly filmed days before Garcia’s death, showed the pair directing racial slurs at customers. Detectives used that lead to focus on Moon and Kim. The social media confrontation was unrelated to Garcia, but it became a turning point in identifying the suspects.
Moon and Kim were arrested March 9, 2025, after authorities tracked them and a pursuit followed. The Prius became a major source of evidence. Along with the notebooks, investigators examined items connected to the vehicle and the defendants’ movements. Prosecutors highlighted an entry attributed to Kim on the date of Garcia’s death. It referred to a “dirty deed,” Cerritos and Bloomfield, the name of the avenue bordering the park. The state’s theory treats the phrase as a near-contemporaneous record of the crime. The defense can challenge that interpretation and ask whether the words referred to something else. Reports have not stated whether the entry included Garcia’s name, mentioned a 4Runner or described a shooting.
Los Angeles County prosecutors charged both siblings with murder and attempted robbery. Subsequent reports also identified conspiracy to commit murder as a charge arising from the alleged plans involving relatives. Moon faces an additional count of evading a peace officer and two misdemeanor allegations involving unlawful firearm activity. Early in the case, prosecutors asked that bail be set at $3 million for Moon and $2 million for Kim. Later reports said both defendants were held without bail. If convicted of murder, they could face life imprisonment. The exact potential sentence would depend on the counts proved, any firearm findings and future rulings by the judge.
Moon’s defense attorney has said his client has several medical and mental health conditions. The lawyer also reported that Moon told undercover law enforcement officers he was merely in the wrong place at the wrong time. Prosecutors dispute that account through surveillance evidence, witness statements and the writings. Kim’s response to the family allegations has received less public attention. Neither defendant has had a trial, and both are presumed innocent unless prosecutors prove guilt beyond a reasonable doubt. Testimony at a preliminary hearing reflects what witnesses and investigators say occurred; it is not a final finding that every statement is true.
The case places the older sister in two roles. She is a witness describing years of alleged financial abuse, and she is also a person prosecutors say appeared among the intended victims. Her restraining-order efforts may help establish the history of the dispute, but they do not by themselves prove a later murder conspiracy. The defense may question her recollection, motives or understanding of the property transactions. Prosecutors may respond with documents, messages and the defendants’ own words. Any deed, online real estate listing, restraining-order file or communication with the mother could help jurors determine whether the notebook entries reflected a continuing effort to take the house.
The mother’s present condition and wishes have not been fully described in public accounts. It is also unclear who currently controls the home, whether civil litigation arose from the alleged forged deed or whether guardianship proceedings were involved. Those unanswered questions matter because prosecutors describe the property conflict as a motive, not as the charged killing itself. Garcia’s death occurred in another city and involved a vehicle rather than a house. The state must connect the two settings through evidence showing a common effort by the siblings to solve financial and housing problems through crime.
A court must next determine how the conspiracy claims, property evidence and homicide case will proceed together. Attorneys may litigate whether the notebooks are admissible in full, whether family-history evidence would unfairly prejudice jurors and whether the alleged plans should be tried alongside Garcia’s killing. The prosecution may also present forensic testing, phone records, location data and additional witnesses. Defense lawyers can seek separate trials or limits on evidence that does not directly involve the shooting.
Moon and Kim are due back in court July 22. They remain in custody as the case moves from a family account of disputed property and restraining orders toward a possible trial over Garcia’s death and the alleged plans against relatives.
Author note: Last updated July 10, 2026.