Martin Yost was first accused of second-degree murder but ultimately convicted of the premeditated killing of Dhoua Lao.
MOUNT CLEMENS, Mich. — When Martin Yost first appeared in court after his girlfriend’s death, prosecutors accused him of second-degree murder. More than two years later, a jury convicted him of first-degree premeditated murder, an offense carrying mandatory life in prison without parole.
The difference between those two stages defines the legal path of the case. Yost was arraigned Nov. 16, 2023, three days after police found him unconscious in a vehicle with 45-year-old Dhoua Lao dead in the passenger seat. At that early hearing, the Macomb County Prosecutor’s Office alleged that Yost had beaten Lao to death and asked that he be held on a second-degree murder charge. A judge remanded him to the county jail, where he has remained without bond.
On June 12, 2026, after a two-week trial before Circuit Court Judge Rachel Rancilio, jurors found Yost guilty of first-degree premeditated murder. The verdict required findings beyond those necessary for the original charge. Under Michigan law, first-degree premeditated murder involves a willful, deliberate and premeditated killing. The statute directs that an adult convicted of that offense be imprisoned for life without eligibility for parole. Yost is scheduled to return to court July 28 for formal sentencing.
Early charging decisions are not always the final statement of a criminal case. Prosecutors may alter charges as investigators gather evidence, witnesses testify in preliminary proceedings or a court permits an amended count. In Yost’s case, available public reports do not identify the specific date on which first-degree murder replaced or supplemented the initial second-degree charge. They do establish that the jury considered first-degree premeditated murder and convicted him of that offense after hearing the evidence.
The investigation began Nov. 13, 2023, when a driver reported seeing a man assault a woman inside a car in Detroit, Prosecutor Peter Lucido said. The caller gave authorities a description of the vehicle. About half an hour later, Roseville officers found a matching car on Gratiot Avenue near Interstate 94. Yost was in the driver’s seat and appeared to be unconscious or incapacitated. Lao was beside him and had died from injuries suffered in an assault.
Authorities believed Lao was attacked in Detroit and then placed in the vehicle before it was driven to Roseville, according to WDIV. Police said Yost was covered in blood when officers reached the car. Lao had extensive trauma to her head, face and hands. Lucido said the injuries to her hands appeared consistent with defensive wounds. Although public descriptions of the scene were graphic, the legal importance of the injuries was their potential to show the nature, duration and intent of the attack.
Second-degree murder generally requires proof that a defendant unlawfully killed another person with the state of mind required for murder, but it does not require the additional finding of premeditation needed for first-degree premeditated murder. The prosecution’s eventual trial theory therefore had to address not only who caused Lao’s death but also whether Yost formed the intent in a manner that met the higher statutory standard. The verdict shows the jury found that prosecutors carried that burden.
Evidence concerning the couple’s communications helped prosecutors address intent. According to a trial report cited by Law&Crime, jurors saw text messages in which Lao begged Yost not to kill her and offered him money not to hurt her. Prosecutors used the communications to describe a relationship marked by fear and violence. Only portions of those messages have been publicly reported, and the complete exchanges cannot be independently evaluated from the available articles. Still, the disclosed content gave jurors evidence predating the discovery of the car.
The prosecution also had the eyewitness report, the timing of the police search, the location of the vehicle and the physical evidence found inside it. Each category served a different function. The caller provided a near-contemporaneous account of an assault. Officers documented where and how they found Yost and Lao. Medical and scene evidence addressed the cause and severity of Lao’s injuries. The messages offered context about prior threats or fear. Prosecutors combined those parts into a case for intentional, premeditated murder.
The public reports reviewed do not provide the same level of detail about the defense. They do not say whether Yost’s lawyers challenged identity, causation, intent, the admissibility of communications or the distinction between first- and second-degree murder. It would therefore be inaccurate to assign a defense theory that has not been documented. The jury’s verdict means only that, after the evidence and legal instructions were presented, all jurors agreed the state had proved first-degree premeditated murder beyond a reasonable doubt.
Yost’s criminal history formed part of the background reported after his arrest. The Detroit News said he had previous convictions for domestic violence, carrying a concealed weapon and fleeing police. He completed parole about three weeks before Lao’s death. Lucido said it was unclear whether Lao knew of that record or Yost’s recent release from supervision. Prior convictions do not independently prove a later crime, and the trial verdict had to rest on evidence admitted in the murder case.
The first-degree conviction greatly narrows the sentencing judge’s discretion. Michigan’s first-degree murder statute prescribes life without parole for an adult offender, unlike many crimes for which a judge selects a minimum and maximum term from a broader range. The July 28 proceeding is still required to enter the sentence formally, resolve applicable court orders and create the final trial-court judgment. The hearing may also include statements from Lao’s relatives about the consequences of her death.
Lao was a mother of two and was 45 when she was killed, according to WDIV. Prosecutors described the case as domestic-violence related. After the verdict, Lucido said it represented the worst possible outcome of domestic violence and praised the work of investigators, Lao’s family and the prosecution team. He said no decision could reverse the family’s loss but hoped the conviction would provide some peace. The county identified Sian Hengeveld and Erica Clute-Cubbin as the prosecutors who tried the case.
A trial judgment does not necessarily end all litigation. Yost may file post-trial motions or pursue an appeal after sentencing, though the sources reviewed did not report that he had announced either step. An appellate court would review claimed legal errors under applicable standards; it would not simply conduct a second trial because the defendant disagreed with the verdict. Unless the conviction is overturned or otherwise modified, the life-without-parole requirement will control his punishment.
The case’s legal progression reflects how the criminal process can move from a preliminary allegation based on an unfolding investigation to a final verdict based on evidence tested in court. In November 2023, officials emphasized that Yost was charged and presumed innocent. In June 2026, the jury’s decision replaced that unresolved accusation with a conviction for the state’s most serious category of homicide.
Currently, Yost is being held in the Macomb County Jail awaiting sentencing before Rancilio. The July 28 hearing will close the ordinary trial phase of the case and formally record the punishment required by law, while any later challenge would move into separate post-conviction or appellate proceedings.
Author note: Last updated July 15, 2026.