A crazed cannibal was caught chewing the flesh from a man's face after eating his ear and eyeball after bashing him to death in a 7-Eleven car park, police say.

Colin Czech, 29, is charged with murder after police found him covered in blood and kneeling above the man's mutilated head, just off the Las Vegas strip.

The homeless man admitted to police he 'used his teeth to eat [the victim's] eyeball and ear', his arrest report alleged.

Czech faced Las Vegas Justice Court on Wednesday where he made bizarre facial expressions and his lawyer argued he was too insane to stand trial.

Colin Czech, 29, faced Las Vegas Justice Court on Wednesday charged with bashing a man to death and eating his ear and eye, where he made bizarre facial expressions

Witnesses called 911 at 4.44am on Sunday after seeing Czech tackle a man, identified as Kenneth Brown in court documents, to the ground.

He was 'banging [Brown's] head on the concrete, appeared paranoid, was screaming and yelling, and pacing in front of the business'.

Police alleged Czech murdered brown by repeatedly bashing his head on the concrete, causing his death from severe head injuries.

The 7-Eleven parking lot is at 1100 S Las Vegas Boulevard, steps from the famous Haunted Museum and Little White Chapel.

Another 911 call was placed at 5.33am saying the same man was 'eating the face of the male on the ground' at a nearby bus stop. Police arrived four minutes later and were horrified to allegedly find Czech with blood and 'biological matter' on his face, hands, mouth, and clothing.

Czech was caught chewing the flesh from a man's face after eating his ear and eyeball after bashing him to death in this 7-11 car park, police allege

 A 911 call claimed Czech was 'eating the face of the male on the ground' at a nearby bus stop, and police arrived to find him kneeling over the victim and covered in blood

Brown was unresponsive and bleeding from his head and was missing his left ear and left eye.

Czech was 'kneeling on the ground' next to Brown's head and when cops asked what happened, he 'gave a blank stare' and didn't say anything, authorities said. 

Czech was taken to hospital as he was 'going in and out of consciousness', while Brown was pronounced dead on arrival.

Czech later told detectives he was homeless and hadn't slept for five nights in a row because something was 'possessing him.'

He allegedly claimed Brown 'attacked him' and he thought he was fighting a 'shape-shifter' but was helped to victory by a 'higher power.'

Voices in his head told him to kill a person called Drake, whom he didn't know and thought it was Brown, he allegedly told police. Czech also said he was 'tweaking.'

Czech admitted to police he 'used his teeth to eat [the victim's] eyeball and ear,' his arrest report alleged

Chief deputy public defender David Westbrook (pictured) told the court Czech was insane and was granted a competency hearing on May 24

When asked what he used to attack Brown, he allegedly said 'my teeth' and that he 'he used his teeth to eat [Brown's] eyeballs and ears'.

Chief deputy public defender David Westbrook told the court Czech was insane and was granted a competency hearing on May 24.

'I've spoken to him, and I've determined that he is incompetent,' he said.

'We will get to the bottom of all the factual allegations, that is a process. But before we get there we have to go into the competency proceedings.' 

Should the hearing determine Czech is too mentally incompetent to stand trial, he would be sent to a mental institution for treatment until that changed.

Czech was remanded in custody without bail and is behind bars at Clark County Detention Center.