Neighbors of Justin Mohn, who beheaded his father, say he was 'acting strange' and smoking marijuana heavily before the gruesome murder

Neighbors of the Pennsylvania man accused of killing his father before displaying his severed head in a YouTube video have described him as 'unhinged' in the months leading up to the grisly murder.

Justin Mohn, 32, now faces charges after allegedly beheading his father, 68-year-old Michael Mohn, at the family's Levittown home on Tuesday.

'Something was unhinged with him,' Carrie McCarthy told WPVI-TV. She said she clicked on the 14-minute video and screamed.

'He's a fixture in the neighborhood,' McCarthy continued. 'He would just walk around, always have his water bottle. And he would stop in random spots and just light up a joint and just start smoking.' 

Another neighbor, Bart DeHaven, said Mohn began 'acting funny' over the summer - to the point where he phoned authorities.

Justin Mohn, 32, has been described by neighbors as 'unhinged' in the aftermath of the grisly beheading death of his father, 68-year-old Michael Mohn

Mohn is accused of murdering his father in the family home. In a video posted to YouTube, he holds up the severed head in a plastic bag and refers to his father as a 'traitor to the country'

One neighbor, Carrie McCarthy, said Mohn would often walk around the neighborhood and 'light up a joint and just start smoking'

'I made a couple calls to the police department because he was sitting right there on that culvert thing and staring at my house constantly,' DeHaven explained. 'I thought that's kind of strange.'

The neighbor denied ever feeling threatened. 

'But it's just weird for somebody to stay seated right there, stare straight at my house. You know, when I would come home, he would just pick up and move,' he said.

Mohn was apprehended roughly 100 miles away from the family home Tuesday night by a National Guard base in Fort Indiantown Gap. He was charged with first-degree murder.

Hours earlier, his mother discovered the headless body and called police.

Mohn's father worked for the U.S. Army Corps of Engineers Philadelphia District and was branded a 'traitor to the country' in his son's rambling manifesto video.

'It's unbelievable. It's very fresh. We can't believe it,' Mary Jasch, the victim's sister, told DailyMail.com.

'I can't even think what his wife is going through. No one can believe it.'

Michael Mohn worked as an engineer for the U.S. Army Corps of Engineers Philadelphia District before his death. His wife, Denice, called police after she came home and found his headless body

Police discovered Michael's severed head inside a cooking pot in a bedroom and recovered a large knife as well as a machete from a bathroom next door

Mohn's mother, Denice, told police she had left the house around 2pm. Her husband and son were the only ones home at the time of the murder.

Police discovered Michael's severed head inside a plastic bag that had been placed in a cooking pot in a bedroom.

In the bathroom next door, investigators recovered a large kitchen knife and a machete from the tub. Bloody rubber gloves were also found in a first-floor bedroom.

Angela Watson, communications director for the Pennsylvania Department of Military and Veterans Affairs, told DailyMail.com that Mohn's cellphone was pinged as he travelled upstate.

As Middletown police rushed to apprehend him by the military base, they warned nearby businesses to lock their doors, she said.

'He was then tracked down outside of the facility, where officers discovered his vehicle but he was not inside of it,' Watson continued.

'There was another ping inside the installation and at that point State Police were informed. Mohn was found walking the installation on one of the main roads and was taken into custody without incident.'

Watson added that he was carrying a firearm.

Fort Indiantown police were notified of his presence in the area at 9pm. The 32-year-old was arrested soon after and held in a cell overnight before being transferred back to Middletown Police Department.

Another neighbor said Mohn began 'acting funny' over the summer, and his strange behavior was enough to prompt the neighbor to call police

The neighbor said Mohn would sit across from his house and stare at it 'constantly' - however, he conceded he never felt threatened beyond finding the behavior 'weird'

In the gruesome YouTube clip, Mohn briefly discussed his motivations behind murdering his father before going on a long-winded rant against the government.

With the camera rolling, he held up father's severed and bloodied head, encased in plastic.

'This is the head of Mike Mohn, a federal employee of over 20 years...and my father,' Mohn said. 'He is now in Hell for eternity as a traitor to his country.' 

The University of Colorado graduate referred to himself as 'the commander of America's national network of militias, which you may know as Mohn's Militia.'

In the minutes following, he made frequent references to God and Satan and called for people to follow him.

'Prior to the 2020 presidential election, some electors and campaign contributors in both the Republican and Democratic parties saw me as the best candidate for president of America, despite my age,' Mohn said.

He claimed he 'could've been the first unanimously-elected president since George Washington.'

The 32-year-old ranted against 'socialists, globalists and communists' and blamed the federal government for 'woke mobs' that were 'destroying the country.'

In a 14-minute clip uploaded to YouTube, Mohn displayed his father's severed head before going on a rant against the federal government. The video was viewed thousands of times before it was taken down

The 32-year-old claimed he could have been 'the first unanimously-elected president since George Washington'

Mohn offered a $1 million bounty for the murder of top officials including FBI Director Christopher Wray, Attorney General Merrick Garland and former Attorney General Bill Barr

Mohn said he was offering a $1 million bounty to anyone who could kill officials including FBI Director Christopher Wray, Attorney General Merrick Garland and former Attorney General Bill Barr.

The Pennsylvania man previously filed a lawsuit against the United States after he failed to secure a job.

According to court documents filed in 2023, Mohn argued that he deserved more than $10 million from the United States because his degree 'did not lead to better jobs or higher pay, but rather disadvantaged him because he was perceived as an "overeducated, white male" and "affirmative action" policies hurt his career chances.'

Talking points in the video echo beliefs associated with QAnon, a far-right conspiracy theory that originated in 2017 and hinges on fabricated claims made by anonymous individuals called 'Q.'

The video was viewed 5,000 times before it was pulled down.