Police say the caller remained at a Peavy Road apartment, where officers found his father dead and recovered a suspected weapon.
DALLAS, Tex. — The first account of Samuel Mendoza’s death came not from a neighbor or passing witness but from his son, who police say called 911, reported the stabbing and waited at the east Dallas apartment where officers arrested him.
That call set the timing of a homicide investigation that began shortly after sunrise June 17 in the 2800 block of Peavy Road. Dallas police said officers were dispatched at approximately 7:17 a.m. and encountered 29-year-old Adrian Mendoza at the location. Inside, first responders found Samuel Mendoza mortally wounded. Dallas Fire-Rescue pronounced him dead, and officers took the younger Mendoza into custody on a murder charge. The case was assigned number 087451-2026 and remained under investigation after the arrest.
The call is important because it may provide investigators with a contemporaneous account of what the caller claimed had happened before officers entered the residence. According to an arrest affidavit cited by CBS Texas, Adrian Mendoza told the dispatcher that he had stabbed his father. Public reports have not included the complete recording or transcript, so it is not known what questions the dispatcher asked, how long the call lasted or whether Mendoza made other statements about the events inside the apartment.
Dispatch records would also establish when the call was received and when officers were sent, providing a framework against which investigators can compare physical evidence and later statements. Police reported no search for an unknown assailant and said Mendoza was arrested at the scene. The department’s initial announcement described Samuel Mendoza only as a person known to the suspect, while the subsequent affidavit account identified the family relationship and said the older man had been asleep when the attack began.
Officers found Samuel Mendoza lying on an air mattress, the affidavit said. Reports based on the document described multiple wounds. The scene also contained a large combat-style knife in a sheath on a table, where it appeared to have blood on it. Authorities treated the knife as the suspected weapon. The available records do not say whether it was photographed where officers first saw it, tested for fingerprints or DNA, or formally matched through laboratory analysis to the injuries.
Those unanswered points are normal at the beginning of a homicide case. An arrest affidavit generally presents enough information for a judge to determine whether probable cause exists to hold a suspect. It does not normally include every photograph, test result, interview or piece of evidence gathered during the investigation. A complete prosecution file can develop over weeks or months as police receive autopsy findings, laboratory reports, recordings and statements from possible witnesses.
Police said Adrian Mendoza was taken to headquarters after his arrest. According to the affidavit, detectives read him his Miranda rights, and he agreed to an interview. Investigators reported that he admitted stabbing his father at least four times while the older man slept. The public account does not say whether the interview was recorded, how long it lasted or whether Mendoza asked for an attorney at any point. Any recording and the circumstances surrounding the questioning could later be reviewed by prosecutors, defense counsel and the court.
Mendoza’s reported explanation introduced questions that the initial evidence did not answer. The affidavit said he told detectives he believed his father was killing people and hurting children. Police said he supplied no evidence for that assertion. He allegedly said he would use whatever method he could to “stop his existence.” When investigators asked why he had not reported his accusations to law enforcement, Mendoza gave a response involving what he said he had learned through Duolingo, according to the document.
The affidavit does not establish that Samuel Mendoza committed any of the acts his son allegedly described, and police expressly said the defendant offered nothing to support the claims. No public police statement identified another alleged victim, an earlier complaint or a related investigation involving Samuel Mendoza. Publishing the accusation without that context could wrongly turn an unsupported statement into an implied fact. In the official account, it is evidence only of what Adrian Mendoza allegedly told detectives when asked about his reason for the attack.
The reported language may lead investigators and lawyers to examine the defendant’s condition at the time of the interview, but public records reviewed for this story contain no diagnosis or clinical evaluation. An unusual answer cannot establish mental illness, incompetency or insanity. Those are distinct medical and legal questions. Competency concerns whether a defendant can understand the proceedings and assist counsel. A defense based on a person’s mental state at the time of an offense requires separate legal analysis and supporting evidence.
Nothing in the available reporting indicates that a judge has ordered such an evaluation or that Mendoza’s lawyers have raised a mental-health defense. No lawyer for him was identified in the reviewed sources. Without a filing or statement from counsel, it would be speculative to predict a defense strategy. Prosecutors likewise had not publicly described how they would use Mendoza’s alleged statements or whether they expected additional charges, amended allegations or a grand jury presentation.
The physical scene may provide an evidentiary account independent of the defendant’s words. Investigators can compare the location and condition of the suspected knife with the pattern of injuries and other material in the apartment. They can examine whether blood, fingerprints or biological material connect an object to the victim or another person. The medical examiner can document the cause and manner of death and assess whether the injuries are consistent with the chronology described in the affidavit.
The case also contains two sets of statements attributed to Mendoza: what he allegedly told the 911 dispatcher and what he allegedly told detectives after receiving Miranda warnings. Courts can treat those settings differently. A call seeking emergency help does not necessarily involve the same custodial conditions as an interview at police headquarters. Lawyers could examine the exact words used, whether questioning was designed to address an immediate emergency and whether the later waiver of rights was knowing and voluntary.
None of those potential questions means the evidence will be admitted or excluded. They describe steps through which courts test evidence rather than accepting an affidavit as the final account. The state retains the burden of proving every element of the charge beyond a reasonable doubt. Mendoza is presumed innocent unless and until that standard is met. His reported admissions are consequential, but a confession allegation does not replace the requirement that prosecutors establish the case with admissible evidence.
Initial reports gave different information about bond. FOX 4 reported on June 17 that Mendoza was being held without bond. Reports published later, citing Dallas County jail information, listed a $250,000 bond. The difference may reflect the timing of an initial booking and a later judicial determination. Publicly reviewed sources did not show that Mendoza had posted bond, been released or received a new bond amount. They also did not identify a scheduled trial or a plea.
Samuel Mendoza’s age was absent from early police coverage. A later obituary identified Samuel Mendoza Fernandez as 58 and said he died in Dallas on June 17. The memorial said he was born in Mexico and described him as a husband, father and grandfather. Police reports used the shorter name Samuel Mendoza. The matching name, city and date indicate the obituary concerns the reported victim, though officials did not publicly discuss the difference in the forms of his name.
The homicide occurred in far east Dallas near the intersection of Ferguson Road and North Buckner Boulevard. Police have not said whether anyone else was in the apartment or whether nearby residents heard or saw anything. The department’s request for information remained attached to its case notice, directing potential witnesses to homicide Detective P. Wheeler. That request leaves open the possibility that detectives are still trying to establish what happened before the 911 call.
The most recent publicly available accounts continued to describe Mendoza as jailed on a murder charge. No subsequent court ruling had publicly resolved the meaning of his reported statements, the admissibility of his interview or the results of forensic testing. Until those records emerge, the 911 call remains the starting point of the public chronology rather than the final legal account of Samuel Mendoza’s death.
Author note: Last updated July 19, 2026.