Miami— It is being called one of this city’s goriest crimes: A naked man was on top of another nude man along a busy highway, biting into the man’s face, tearing it to pieces. A police officer arrived to help, but the mauler growled at him and continued to chew away, stopping only when he was shot to death.

Miami police said little Tuesday about the attack, which took place Saturday afternoon in the shadow of the Miami Herald headquarters. Surveillance video from the newspaper’s security camera showed cars, motorcycles, pedestrians and bicyclists passing by.

The victim, identified as 65-year-old Ronald Poppo, a homeless man who lived under the causeway, was in critical condition.

“He had his face eaten down to his goatee. The forehead was just bone. No nose, no mouth,” said Sgt. Armando Aguilar, president of the Miami Fraternal Order of Police. “In my opinion, he just happened to be in the wrong place at the wrong time.”

Sgt. Javier Ortiz, vice president of the Miami Fraternal Order of Police, said it was one of the bloodiest “and goriest scenes I’ve ever been to.”

It’s not clear what led Rudy Eugene, 31, to attack Poppo. Eugene’s ex-wife, Jenny Ductant, told WPLG-TV he was somewhat paranoid. “I wouldn’t say he had mental problems but he always felt like people was against him … ,” she told the station.

Larry Vega was riding his bicycle off the causeway, which connects downtown Miami with Miami Beach, when he saw the attack.

“The guy was, like, tearing him to pieces with his mouth, so I told him, ‘Get off!'” Vega told Miami television station WSVNI. “The guy just kept eating the other guy away, like, ripping his skin.”

Vega flagged down the Miami police officer, who can be seen exiting his car on the Herald video. Vega said the officer repeatedly ordered the attacker to get off. Eugene just picked his head up and growled at the officer before continuing to maul his victim, Vega said.

The officer shot Eugene, but he just kept chewing, Vega said. The officer fired again, killing Eugene.