Richie Incognito was violent, incoherent and emotional before he was arrested at a funeral home in Arizona -- with one witness saying the NFL lineman asked the staff to "cut his dad's head off for research purposes."
It's all in the police report released by Scottsdale PD in which at least one mortuary staffer told cops he "thought Incognito was going to kill him."
Richie arrived to Messinger Mortuary on Monday after his father passed away. One staffer told police the family had advised him that Richie would not be allowed to attend the funeral because he'd been "acting erratically.