Justin Mohn allegedly killed his father Tuesday ... their home northeast of Philadelphia and posting a video of the severed head online first shot him with a gun he bought the previous day ...

Justin Mohn is accused of killing his father ... In it, he appeared to read from a script before picking up his father's severed head and showing it to the camera, according to a police report.

Michael Mohn was the father of Justin Mohn, the Levittown, Pennsylvania man who is accused in a gruesome beheading displayed ...

Justin D. Mohn has been charged with first-degree murder ... home northeast of Philadelphia and posting a video of the severed head online first shot him with a gun he bought the previous day ...

Justin Mohn, 32, has been charged with murder ... a gruesome video on social media that shows him holding up the severed head, according to police. Justin Mohn, 32, has been charged with murder ...