James Crumbley, the father of Michigan school shooter Ethan Crumbley is found guilty of involuntary manslaughter for failing to safely store the gun his 15-year-old son used to kill four students

The father of Oxford school shooter Ethan Crumbley has been found guilty of involuntary manslaughter after supplying the gun used in the shooting to his son. 

A jury convicted James Crumbley of involuntary manslaughter in connection with the deadly shooting in 2021 after deliberating for ten hours. 

Crumbley, 47, joins his wife Jennifer Crumbley who was also found guilty on February 6 of involuntary manslaughter.

The two are the first parents in the US to be held responsible for a child carrying out a mass school attack.

Their son Ethan, then aged 15, opened fire at the school in Oxford, Michigan, and murdered Hana St. Juliana, Madisyn Baldwin, Tate Myre, and Justin Shilling. 

Crumbley, seen here, joins his wife Jennifer Crumbley who was also found guilty on February 6 of involuntary manslaughter

His son Ethan, then aged 15, opened fire at the school in Oxford, Michigan , and murdered Hana St. Juliana, Madisyn Baldwin, Tate Myre, and Justin Shilling

Ethan Crumbley pleaded guilty to his crimes and is currently serving life in prison without the possibility of parole, after murdering four classmates in the Oxford High School shooting in 2021

He pleaded guilty in 2022 to four counts of first-degree murder and other charges and was sentenced to life in prison without parole in December. 

Crumbley faced four counts of involuntary manslaughter, one for each of the victims at Oxford High School in the 2021 shootings. Jurors began deliberating on Wednesday. 

'This is a very egregious and rare, rare set of facts,' Oakland County, Michigan, prosecutor Karen McDonald told the jury during closing arguments on Wednesday.

McDonald said Crumbley ignored signs that his son was deeply disturbed, did not get him the help he needed, and did not safely store the firearm in the family home.

McDonald also presented the jury with texts that Ethan Crumbley had sent to a friend and journal entries he had written in the months leading up to the shooting.

In those, he talked about wanting medical attention and hearing voices, but he was worried his parent would be 'pissed.'

On one occasion, according to a text message to a friend, Ethan asked Crumbley to take him to the doctor, but his dad 'gave me some pills and told me to suck it up.'

Defense attorney Mariell Lehman argued that James Crumbley could not have possibly foreseen that his son would carry out a mass shooting.

'James had no idea that his son was having a hard time,' Lehman told jurors during her closing argument, saying no evidence had been presented that James knew the contents of his son's text messages or journal.

In court, the prosecution presented a picture showing James, left, with his son Ethan at a shooting range

Justin Shilling, 17, (left) and Tate Myre, 16, (right) were two of four students killed in the senseless shooting at Oxford High School in Michigan

Madisyn Baldwin, 17, (left) and Hana St Juliana, 14, (right) died in the 2021 shooting rampage at Oxford High School in suburban Detroit 

Crumbley, accompanied by Ethan, bought a Sig Sauer 9 mm handgun over Thanksgiving weekend in 2021. 

The boy called it his 'new beauty' on social media. His mother described the gun as a Christmas gift and took him to a shooting range.

Four days after the purchase, the parents went to Oxford High to discuss a violent image their son had drawn on a math assignment.

Alongside the drawing including phrases that said: 'The thoughts won´t stop. Help me.' There was a gun on the paper that looked similar to the Sig Sauer.

The Crumbleys didn't take him home, and school staff - believing he might be suicidal - also didn't demand it. 

But no one checked the boy's backpack for a gun, and the shooting happened that afternoon.

During the trial, prosecutors showed that the gun, a newly acquired Sig Sauer 9 mm, was not safely secured at the Crumbley home. 

On the morning of the school shooting, teachers became concerned after finding alarming drawings and writings on his homework, seen here

He had kept the guns in a drawer under the island of his kitchen, keeping both a Derringer and a KelTech in the box secured with just a '000' code 

He had kept the guns in a drawer under the island of his kitchen, keeping both a Derringer and a KelTech in the box secured with just a '000' code. 

ATF Special Agent Brett Brandon testified that when he inspected Ethan's 9mm, he 'found no evidence that a cable lock was ever installed on that firearm.'

The cable lock was found in the gun box still in its original packaging, despite Brandon noting it would have taken around 10 seconds to secure. 

In a dramatic step, the prosecutor demonstrated how to use a cable to lock the gun that was used in the shooting. 

Jennifer Crumbley was found guilty on February 6 of involuntary manslaughter, making her the first parent in the US to be held responsible for a child carrying out a mass school attack.

Prosecutors said that Jennifer Crumbley was more interested in pursuing an extramarital affair with a local fireman that caring for her son.

Following the killings, she texted her lover Brian Meloche that the shooting 'could have been prevented' and that the school should not have allowed him to return to class.

The gun used in the shooting was a Sig Sauer 9mm his father had purchased with him just four days earlier, seen here

Crumbley's parents, James and Jennifer were both charged in connection with the shooting

Crumbley's secret lover claimed she wanted to meet up the morning of the shooting, and said they had been meeting regularly in a parking lot across from her work. 

Crumbley told her lover that she had 'failed miserably' as a parent after her son was arrested for the murders. 

Her son Ethan addressed a packed court room after he was sentenced to life in prison. 

He said: 'What I did. My actions were because of what I chose to do. I could not stop myself, I do not diminish any ability to anyone that could have stopped me.

'They did not know and I did not tell them what I planned to do so they are not at fault for what I done. 

'I am a really bad person. I've done terrible things no one should ever do, I have lied. I've hurt many people, that's what I have done. 

'Whatever sentence it is I do plan to be better. I will change, it may not show it now but I am trying. 

'All I want is for the people I hurt to just have a final sense of culpability that justice has been served in any capacity. 

'Any sentence they ask for I ask that you do impose it on me, I want them to be happy, to feel secure. I do not want them to worry another day. I am really sorry. I cannot give it a back.'

In a journal, the shooter wrote about his desire to watch students suffer and the likelihood that he would spend his life in prison. 

He made a video on the eve of the shooting, declaring what he would do the next day. 

Jennifer Crumbley is set to be sentenced on April 9 and could face a sentence of up to 60 years in state prison.