Pictured: Husband who killed his wife, three of his four sons, aged 18, 14 and 12 then himself in horrific murder-suicide at their Oklahoma home as orphaned son, 10, survives unharmed

A dad murdered his wife and three of his four sons before turning the gun on himself, police have said. 

Jonathon Candy, 42, is believed to have killed his wife, 39-year-old Lindsay Candy, and sons 18-year-old Dylan, 14-year-old Ethan and 12-year-old Lucas.

Officers found the five dead Monday morning after a fourth son, who is 10, called police to report the shootings, said Sgt. Gary Knight. Knight said that Candy then turned the gun on himself.

'It remains a mystery as to what caused Mr. Candy to murder his wife and three of his children. We don't know' why the fourth child was spared or a motive for the killings', Knight said.

The 10-year-old was placed in the custody of relatives. Police had no previous contact with the family and had not previously been called to their home, he said.

Lindsay Terry Candy, 39, pictured with her husband Jonathon, 42, during a vacation in Florida in 2023

Jonathon Candy, 42, is believed to have killed his wife, 39-year-old Lindsay Candy, and sons 18-year-old Dylan, 14-year-old Ethan and 12-year-old Lucas

The victims included two minors and one recent high school graduate, according to authorities. They were found inside this home in a small community on the outskirts of Oklahoma City 

Knight stressed during his first media briefings that the family members didn't die from 'a carbon monoxide situation or anything like that. These are five people who were killed.'

Knight told WWNYT that investigators believe the shooting began after an argument between the parents on Sunday night or early Monday morning.

The bodies of the victims' were found in different areas of the home, with police saying they found two bodies upstairs, and two others downstairs. One of the children had been shot in bed, according to KOCO.  

Two of the children, Ethan and Lucas, were students in the Mustang Public School system. Dylan Candy graduated from a local high school in 2023. 

Superintendent Charles Bradley wrote in a statement to parents: 'We are shocked, and our hearts are broken; this tragedy simply defies understanding. 

'While this has been a very difficult year for the MPS Family, both students and adults may struggle with managing their feelings and reactions to this news. 

'Our Crisis Response Team has been present at schools today and will continue to be in place moving forward for as long as they are needed.

Neighbor Brian Graham told KFOR: 'Nobody expected it, it was very shocking. You know, like I said, they were a great family.

'They were good friends of ours. They would come down all the time and we kind of had hangouts together. 

Investigators believe the shooting began after an argument between the parents on Sunday night or early Monday morning. Ethan Candy, left, and Dylan Candy, right, are seen here

Two of the children, Ethan and Lucas, were students in the Mustang Public School system. Dylan Candy graduated from a local high school in 2023

'This wasn't a gas leak situation or a fentanyl-type situation, these are five people who were killed,' one local cop said

'We’re really going to miss them. We really wish this wouldn’t have happened,' he added. 

According to his LinkedIn page, Jonathon worked as a video engineer for a company named Cox Media. 

'There are no words to express how heartbroken I am to learn that this unthinkable scene is the beloved Candy family,' a family friend wrote on Facebook. 

'So senseless. The few times I met them seemed like your typical all American family,' a commenter wrote. 

The family lived in a subdivision named Czech Hall Estates in Yukon, Oklahoma, where homes ranged from $211,000 to $365,000.