Army SSG John Diamond Convicted of Murder of Air Force Capt. Frank Theer; Military Court Sentenced to Life in Prison, No Parole (August 28, 2001)

Michele Theer photo
John Diamond, US Army

Army SSG John Diamond, 28, was accused of fatally shooting Air Force Capt. Frank ‘Marty’ Theer in Fayetteville, North Carolina on December 17, 2000. Capt. Theer and his wife Michelle were on their way to a Christmas party when Michelle claimed she needed to stop at her place of employment. After waiting for awhile, Capt. Theer exited his vehicle to check on Michelle. As he ascended the stairs at the office building, he was shot multiple times and died at the scene. The Fayetteville Police Department launched a homicide investigation and would learn that Michelle Theer was having an affair a married Fort Bragg Army Ranger named John Diamond. It was later theorized that psychologist and Air Force Reservist Michelle Theer was the mastermind behind the murder of her husband. She was accused of setting Capt. Theer up when she lured him to her office; she was also accused of manipulating SSG Diamond to commit the murder. The prosecutor’s theorized the motive for the homicide of Capt. Theer was the Servicemen’s Group Life Insurance money.

During the investigation, the police got a tip that a gun matching the murder weapon was in the custody of SSG Diamond which connected him to the crime. Conveniently, SSG Diamond admitted to having a gun that fit the description of the one used in the murder but he claimed his vehicle had been broken into and the gun was stolen. SSG Diamond was arrested by the US Army for having an unregistered weapon on a federal installation while they investigated his role in the murder. They would learn that despite his marriage status, he was in love with Michelle Theer and would do anything for her. The military courts charged SSG Diamond with first degree murder and on August 28, 2001, a six-member military panel at Fort Bragg found him guilty; Staff Sgt. John Diamond was sentenced to life in federal prison. Michelle Theer disappeared by the time the civilian authorities caught up with her but she was eventually located in Florida living under an assumed identity. Michelle Theer was convicted of conspiracy to commit first degree murder on December 3, 2004 and sentenced to life in prison, no parole.

Investigation Discovery:

In 2000, Michelle Theer was an Air Force wife in the military town of Fayetteville until a fatal shooting made her a widow. The investigation into her husband’s death led police to the door of an Army Ranger – taking orders from very unlikely accomplices. -Fayetteville, Sins and Secrets (S2,E3)

Sexy psychologist and doting Air Force wife Michelle begins a swinging affair with Army Sgt. Diamond while her husband, Captain Marty Theer, is away. But all’s fair in love and war, and Marty’s return will remind them that love is a battlefield. -Sergeant Swinger, Scorned: Love Kills (S4,E1)

Oxygen:

A frantic, distraught woman runs into a video rental store screaming that her husband has been shot. -Michelle Theer & John Diamond, Killer Couples

Killer Couples: S8 E5 Preview – Michelle Theer and John Diamond | Oxygen

Killer Couples: S8 E5 After the Verdict – Michelle Theer and John Diamond | Oxygen

Psychologist Debbie Layton-Tholl talks about her experience meeting with Michelle Theer. -Michelle Theer & John Diamond, Killer Couples

A lonely military wife and psychologist go searching for sex on the Internet with deadly results. -Michelle Theer & John Diamond, Killer Couples (S8,E5)

Editor’s note: With a cable subscription, you can download the free ID Go app and watch Investigation Discovery programming at your convenience. And for those who do not have cable, you can watch “unlocked” episodes on the ID Go app including the latest premieres. For those who prefer commercial free programming during your binge session, Prime Video has an ID channel: ‘True Crime Files by Investigation Discovery” available for $3.99 a month. It’s a compilation of older seasons but totally worth the cost if you are a true crime addict. Download the ID Go app or purchase ID True Crime Files & binge away.

Related Links:
Website: Free John Diamond
Staff Sgt. John Diamond | The JAG Hunter
Wife of Slain Soldier Charged with Murder
Makeover Madness | People Magazine Investigates
Conviction of pilot’s wife in killing upheld
United States v. Staff Sergeant John M. Diamond (2007)
Investigator: Did Michelle manipulate for murder?
Witness: Did Michelle manipulate for murder?
John Diamond vs United States of America (2010)
Convicted killer wants prison to stop censoring his racy letters
Sinclair Takes His Legal Battle Online
Michelle Theer case featured on ‘Killer Couples’
Psychologist Michelle Theer, Her Internet Affair With John Diamond, and the Murder of Air Force Captain Marty Theer
On the Firing Line | Military Corruption
Army Wives: The Unwritten Code of Military Marriage | Tanya Biank
Cyber Reconnaissance, Surveillance and Defense | Robert Shimonski
Murder Along the Cape Fear: A North Carolina Town in the Twentieth Century | David Morgan
The Officer’s Wife: A True Story of Unspeakable Betrayal and Cold-Blooded Murder | Michael Fleeman
Fayetteville | Sins and Secrets | Investigation Discovery (S2,E3)
Fayetteville | Sins and Secrets | Investigation Discovery (website)
Fayetteville | Sins and Secrets | Investigation Discovery (Amazon)
Sergeant Swinger | Scorned: Love Kills | Investigation Discovery (S4,E1)
Sergeant Swinger | Scorned: Love Kills | Investigation Discovery (website)
Sergeant Swinger | Scorned: Love Kills | Investigation Discovery (Amazon)
Killer Couples: S8 E5 Sneak Peek – My Husband Has Been Shot! | Oxygen
Killer Couples: S8 E5 Preview – Michelle Theer and John Diamond | Oxygen
Killer Couples: S8 E5 After the Verdict – Michelle Theer and John Diamond | Oxygen
Killer Couples: S8 E5 Bonus Clip – Michelle Was Villified by the Media | Oxygen
Michelle Theer & John Diamond | Killer Couples | Oxygen (S8,E5)
Michelle Theer & John Diamond | Killer Couples | Oxygen (Amazon)
Air Force Capt. Frank Theer Murdered by Unidentified Gunman; Wife Michelle & Army SSG John Diamond Sentenced to Life in Prison (December 17, 2000)
Former Air Force Reservist Michelle Theer Convicted of Murder of Husband Frank Theer; Sentenced to Life in Prison, No Parole (December 3, 2004)
Sins and Secrets Premiered ‘Fayetteville’ on Investigation Discovery: Michelle Theer & John Diamond Left a Permanent Mark on Community (January 26, 2012)
Scorned, Love Kills Premiered ‘Sergeant Swinger’ on ID: Air Force Captain’s Murder Reveals Wife’s Evil Intent, Adultery & Greed (October 4, 2014)
Killer Couples Premiered ‘Michelle Theer & John Diamond’ on Oxygen: Affair Leads to Murder of Air Force Capt. Marty Theer (September 3, 2016)
Scorned, Love Kills: 6 Active Duty Military Homicide Cases Featured on Investigation Discovery

Fort Carson Soldier Christopher Walton Fatally Shot Outside Night Club; Leroy Davis Sentenced to 20 Years in Prison by Military Court (November 21, 1991)

All Hell Breaks Loose In Club Brawl Leaving A Young Solider Dead -Victim Zero, Homicide Hunter (Preview)

Lt. Joe Kenda of the Homicide Hunter series on Investigation Discovery discussed the murder of Fort Carson Army soldier Christopher Walton, 21, outside a night club in Colorado Springs, Colorado on November 21, 1991. What started out as a good night out on the town turned deadly after two rival units started a brawl at a local bar in Colorado Springs. The fight spilled outside of the bar and that’s when Christopher Walton was shot with a gun in the neck. Christopher Walton was getting ready to get out of the Army and move back to North Carolina. He was a described by his friends as a really good guy who took care of people.

As Kenda investigates the case, which is in his jurisdiction, he learns that a few months earlier a couple of soldiers got in a fight over a girl and that’s when everyone chose sides and the rival began. The rival was between the artillery unit and the maintenance unit at Fort Carson. An informant told Kenda that she thought Chris Smith may have committed the murder. Kenda pays Chris Smith a visit and in deed finds a gun similar to the gun they were looking for in his possession. It was later determined by ballistics that this gun matched the bullet recovered from Christopher Walton’s body.

Chris Smith was arrested for the murder of Christopher Walton. He never admitted to the murder and told Kenda that he had given the gun to someone else that night but would not give up the name. While Smith was in custody, the Army’s Criminal Investigation Division (CID) called Lt Joe Kenda to tell them they had a witness to the event and they thought he might have the wrong guy. The witness, Eric Walker, identified Leroy Davis as the actual shooter. Leroy was a member of the artillery unit at Fort Carson which was the rival unit to Christopher Walton’s maintenance unit.

As it turns out, Chris Smith was telling the truth. He did give the gun to someone that night outside the bar after shooting it in the air because he didn’t want it on his person. Eric Walker told Kenda that Chris Smith gave the gun to Leroy Davis who eventually returned the gun back to Smith. Chris Smith refused to implicate his Army brother, even after he was arrested and jailed. According to Walker, Christopher Walton pushed one of the artillery unit members and Leroy Davis acted on emotional impulse, pulled the gun out of his jacket, and shot Walton in the neck causing his fatal injuries.

For some unknown reason, Leroy Davis faced a court martial as opposed to a being tried by the civilian courts in Colorado Springs. Lt Joe Kenda described military discipline as a whole different game, sharing that they are “draconian and ruthless.” The military has its own internal justice system and has been at the center of a controversial debate in Congress for the past few years over the way it handles violent crimes. In this case, Davis was sentenced to twenty years at Fort Leavenworth where he will be expected to do hard, physical labor the entire time. We learned from one of the soldiers present at the scene that fifteen military members from Fort Carson got discharged as a result of their involvement in this incident.

Investigation Discovery:

A massive brawl erupts at a local bar ends with the shooting death of a young army soldier. To unravel the murder, Lt. Joe Kenda must infiltrate a revered military institution, and expose a dangerous vendetta. -Victim Zero, Homicide Hunter (S5,E9)

Editor’s note: With a cable subscription, you can download the free ID Go app and watch Investigation Discovery programming at your convenience. And for those who do not have cable, you can watch “unlocked” episodes on the ID Go app including the latest premieres. For those who prefer commercial free programming during your binge session, Prime Video has an ID channel: ‘True Crime Files by Investigation Discovery” available for $3.99 a month. It’s a compilation of older seasons but totally worth the cost if you are a true crime addict. Download the ID Go app or purchase ID True Crime Files & binge away.

Related Links:
Victim Zero | Homicide Hunter | Investigation Discovery (preview)
Victim Zero | Homicide Hunter | Investigation Discovery (S5,E9)
Victim Zero | Homicide Hunter | Investigation Discovery (website)
Victim Zero | Homicide Hunter | Investigation Discovery (Amazon)
Victim Zero | Homicide Hunter | Investigation Discovery (Hulu)
Lt Joe Kenda of Homicide Hunter Outlines Murder of Army Soldier Christopher Walton
Homicide Hunter Premiered ‘Victim Zero’ on ID: Fort Carson Soldier Christopher Walton Fatally Shot Outside Colorado Springs Night Club (October 20, 2015)
Violent Crime, Suicide & Non Combat Death at Fort Carson, Colorado (US Army)