A 27-year-old metal worker in Indianapolis has been charged with attempted murder after he allegedly attacked a colleague with a hammer, then walked out and calmly told another co-worker: ‘S*** happens.’

Austin Hahn was turned in by his mother last week following the August 20 attack at Bright Sheet Metal Company.

Hahn was said by other factory workers to have been good friends with the man he attacked, until recently. It is not known why they fell out.

One employee told police, in court records obtained by Law & Crime, that Hahn had been ‘best of friends’ with the other man until they had an argument, but Hahn apologized to the victim, and everything seemed fine.

Hahn’s roommate, however, told police that the two were not close because Hahn had been using marijuana ‘a lot’ lately, WXIN reported. 

The victim, who has not been named, told police he was at his workstation – which he shared with Hahn – when he was suddenly struck in the back of the head and went unconscious.

He did not know who attacked him, but told police their co-workers would have seen the attack.

Hahn allegedly hit the man six or seven times in the back of the head with a hammer, leaving him with multiple skull fractures, brain bleeds, a punctured jaw, and missing teeth.

Hahn and his victim both worked at Bright Sheet Metal in Indianapolis

Hahn is accused of hitting his former friend over the head multiple times with a hammer

Hahn then allegedly walked calmly out the building and threw the hammer used in the attack in the trash.

He paused to pat another colleague on the chest, WXIN reported, and tell him: ‘S*** happens.’

Hahn then got in his car and drove away.

He was arrested later that day, and has been charged with one count each of attempted murder, aggravated battery, and battery by means of a deadly weapon, records reviewed by Law&Crime show.

He is being held without bond, and his next court hearing is October 19.