We don't know what may have caused a young Florida man to commit a gruesome attack late Monday night. We do know how the victims died. It was gruesome. The details that follow may be disturbing.

Austin Harrouff, 19, stabbed a married Tequesta, FL couple in their 50s and a neighbor who tried to help. The crazed attacker was found by deputies crouched over the bleeding body of a man, "biting chunks of his face off" while grunting.

Martin County Sheriff William Snyder told reporters today that his deputies found Austin Harrouff late Monday in the driveway of the victims' home. Officers shot stun guns at him multiple times but couldn't stop him. Nor could a police dog.

"There was an enormous amount of violence in that garage," said Snyder. The attack is believed to have been completely random.

From the Miami Herald report:

Finally, three to four cops were able to wrench the suspect off the dead man. The man was "making animal noises," and "grunting and growling" as officers yanked him away. Inside the garage they found his wife, also stabbed to death. Multiple "weapons of opportunity" were used to beat, slash and attack the couple, including a switchblade the suspect was known to carry. Officials said it looked like the husband tried to fight back. Former North Miami Beach Mayor Jeffrey Mishcon identified the dead woman as his daughter, Michelle Mishcon Stevens, 53. She attended North Miami Beach High. Deputies identified her husband as John Stevens, 59, who attended high school in South Miami-Dade.

Harrouff was identified by authorities as a Florida State University sophomore and fraternity bro who was studying pre-exercise science. The 19 year old was in town with frat brothers, and was eating dinner at Duffy's sports pub a block away with his parents when suddenly got angry and "stormed out."

Harouff gave police a fake name when he was arrested. He is sedated in a hospital in Palm Beach County, Florida.

The victims left behind a daughter, Ivy Stevens.

[via Buzzfeed]