The strangest person I have ever met

An experienced hire in their mid-30s joined our company,
and it seemed like they were trying to project a "tough" persona.
They went around bragging about how they had been to the police station
three times for assault and how they had blown through tens of thousands of dollars in settlements.
Word spread throughout the company, and soon, no one wanted to
hang out with them, eat lunch with them, or even talk to them.
Even when that person spoke, no one would react, making them
essentially an invisible person.
After working like that for a few months, they ended up resigning on their own.
I am still curious about what kind of person they actually were.