Michael “Mike” Harding, a 53-year-old HVAC technician who disappeared in September 2022, was found murdered in Kentucky just three days after he was reported missing. His death became the centre of a multistate criminal investigation involving an alleged murder-for-hire scheme, his estranged wife and a man later convicted of killing him.
Harding had moved from Sacramento, California, to Celina, Tennessee, hoping to build a new chapter of his life. Instead, a seemingly ordinary heating and air-conditioning service appointment led to his disappearance.
The case drew national attention because his estranged wife, Julie Harding, held a senior position with the California Highway Patrol.
Who Was Mike Harding?
Mike Harding was a 53-year-old heating, ventilation and air-conditioning technician who had previously lived in Sacramento.
He relocated to Tennessee, where he continued working in the HVAC industry.
His marriage to Julie Harding had deteriorated, and the couple were estranged when he disappeared.
Julie was a California Highway Patrol commander, making the investigation particularly sensitive because of her law enforcement background.
Although Mike’s work involved travelling to customers’ properties, nothing initially suggested that a routine service appointment would end in violence.
September Disappearance
On September 23, 2022, Harding was reported missing after failing to return from a job in Burkesville, Kentucky.
He had travelled there believing he was responding to an HVAC service request.
When he did not return as expected, concern grew about his whereabouts.
Investigators began examining his movements, the circumstances surrounding the appointment and his last known location.
The case crossed state boundaries because Harding lived in Tennessee but disappeared while working in Kentucky.
What initially appeared to be a missing-person investigation soon developed into a homicide case.
Body Found in Kentucky
On September 26, 2022, investigators discovered Harding’s body inside a vacant house in Cumberland County, Kentucky.
He had suffered four gunshot wounds.
The discovery confirmed that his disappearance was not voluntary and that he had been the victim of a violent crime.
The location of the body raised questions about why Harding had travelled to the property and who had arranged the supposed service appointment.
Detectives began reconstructing the events that led him there.
The evidence eventually directed investigators toward a suspected plan to lure Harding into an isolated location.
Murder-for-Hire Investigation
Authorities investigated the possibility that Harding had been deliberately targeted rather than killed during a random encounter.
Their investigation focused on Thomas O’Donnell, a man accused of carrying out the shooting.
Investigators also examined Harding’s troubled marriage and the circumstances surrounding his separation from Julie.
Prosecutors later presented the killing as part of a murder-for-hire conspiracy.
The case involved investigators working across state lines, with federal authorities also assisting.
Its unusual circumstances attracted widespread attention, particularly because of Julie Harding’s position within the California Highway Patrol.
Who Was Julie Harding?
Julie Harding was Mike Harding’s estranged wife and a high-ranking California Highway Patrol officer.
Her professional background made her connection to the case especially notable.
Investigators suspected that she had arranged for O’Donnell to kill her husband during the couple’s marital dispute.
However, Julie was never tried or convicted in connection with Mike’s death.
That distinction matters: allegations concerning her involvement were developed through the investigation, but her death prevented a criminal trial in which those claims could have been tested against her.
The case nevertheless became closely associated with the suspected involvement of someone who had served in law enforcement.
Thomas O’Donnell Arrested
Thomas O’Donnell was arrested in December 2022 at Sacramento International Airport in connection with Harding’s killing.
His arrest followed an investigation into the circumstances of the September shooting.
Authorities accused him of participating in the plan that led Harding to the Kentucky property.
The criminal proceedings continued for several years as prosecutors prepared their case.
O’Donnell’s arrest represented a major development because investigators had identified a suspect they believed was directly responsible for the fatal shooting.
The case eventually proceeded to trial in Kentucky.
Julie Harding’s Death
On December 10, 2022, Julie Harding was found dead outside the Tennessee home she had shared with Mike.
Her death was ruled a suicide involving a gunshot wound.
It occurred shortly after O’Donnell’s arrest.
Because Julie died before prosecutors could bring the alleged murder-for-hire case against her to trial, she never faced a verdict.
Her death added another tragic dimension to an investigation that had already involved a missing person, a homicide and a complicated marital dispute.
It also left questions about her alleged role to be addressed through evidence presented in proceedings against others.
Trial and Verdict
The criminal case against O’Donnell reached a decisive stage in May 2026.
A Kentucky jury found him guilty of murdering Michael Harding.
The verdict followed years of investigation and legal proceedings connected to the 2022 killing.
The prosecution’s case focused on the circumstances surrounding Harding’s final service appointment and the evidence linking O’Donnell to the crime.
His conviction provided a judicial determination of responsibility for the killing, unlike the allegations against Julie Harding, which were never resolved through a trial against her.
Life Sentence
Following his conviction, Thomas O’Donnell was sentenced to life imprisonment without the possibility of parole, according to reporting on the case.
The sentence marked the culmination of the criminal proceedings against the man convicted of Harding’s murder.
For those following the investigation since September 2022, the outcome answered the central question of who was legally responsible for the shooting.
However, the case remained complicated by Julie Harding’s death and the absence of a trial examining her alleged involvement.
Why the Case Drew Attention
Harding’s murder attracted national interest because several unusual circumstances came together.
He disappeared while responding to what appeared to be a routine work assignment, was discovered dead in another state and was connected to a marital dispute involving a senior law enforcement officer.
The investigation was subsequently featured in crime reporting and documentary coverage, including material associated with CBS’s 48 Hours.
These programmes examined the timeline, evidence and relationships surrounding the killing.
The story also brought renewed attention to the Tennessee property associated with the Hardings.
What Happened to Mike Harding?
Mike Harding is not missing. He was found murdered on September 26, 2022, inside a vacant property in Cumberland County, Kentucky.
He had been reported missing three days earlier after travelling from Tennessee for an HVAC service appointment.
Investigators connected the killing to an alleged murder-for-hire arrangement involving his estranged wife, Julie Harding, and Thomas O’Donnell.
Julie died in December 2022 without standing trial, while O’Donnell was convicted in May 2026 and sentenced to life without parole.
The case remains a disturbing example of how an apparently ordinary work appointment became the setting for a planned killing, leaving Harding’s family to confront years of investigation and legal proceedings.
