CHICAGO — A man has been charged in the attack that critically injured a woman on Michigan Avenue.

Bruce Diamond, 52, is facing one felony count of aggravated battery with great bodily harm. Diamond, who police say did not know the victim, allegedly launched a 3-foot javelin-like log at the woman’s head Monday afternoon in the 600 block of N. Michigan Avenue.

Witnesses say the alleged assailant calmly walked away after the bizarre attack as if nothing had happened.

The woman was transported to Northwestern Memorial Hospital in critical condition.

According to police, Diamond was quickly placed into custody. Prosecutors say city POD cameras and other surveillance captured the assault.

A judge ruled Wednesday that the 52-year-old remains a threat to the community and ordered that he be held at the Cook County Jail until his trial.  

Court records obtained by WGN News show Diamond’s extensive criminal history. In Chicago alone, Diamond has been arrested 19 times. Documents show that Diamond had two convictions in the 1980s, including a 1989 conviction of unlawful use of a weapon and criminal damage to property.

In Ohio, Diamond was convicted 21 times on a variety of disorderly conduct, aggravated menacing and assault charges.

Prosecutors add that Diamond’s rap sheet extends to Indiana with criminal trespassing convictions.