CHICAGO – A convicted felon was charged in the attack of a 91-year-old man in Chinatown.

Police said Alexander Taylor, 45, faces several felony charges in the attack of Yen Jit Wong. According to a statement from police, Taylor is a convicted felon.

Wong was attacked near 24th Street and Wentworth Avenue around noon on Tuesday during his daily walk.

Taylor was seen by an off-duty Chicago police sergeant striking Wong in the face. Police said Wong did not provoke Taylor. Wong fell hard and suffered a broken collarbone and bleeding around his brain.

Sergeant Michael Bazarek just happened to be driving by on a break from a nearby seminar in his personal car with his gun, but no cuffs. While others helped Wong, Bazarek followed his alleged attacker and made the arrest.

Cook County sheriff’s deputy Eddie Garcia was working in the area of the with the sheriff’s “work alternative” program and witnessed the attack.

“He actually turned around and began to walk away like if nothing happened, maybe as to not bring attention to himself,” Garcia told WGN News.

Garcia said he immediately went to attend to Wong who was awake and breathing, but not talking. He called for back-up and a paramedic.

Wong was taken to Northwestern Hospital and was in the ICU. Relatives said Wong is not doing well. He is in the ICU on a feeding tube. Bazarek said his prayers are with him.

Taylor is charged with felony counts of aggravated battery of a victim over 60, aggravated battery causing great bodily harm and aggravated battery in a public place.

Taylor is scheduled to appear in bond court on Friday.