Chicago police are investigating a fatal shooting that took place inside a high-rise Wednesday night.

At approximately 7 p.m., a man was shot in the head in the 8th floor gym in the building located in the 500 block of West Kinzie Street, according to police and witnesses.

The 45-year-old was taken to Northwestern Memorial Hospital in critical condition where he was later pronounced dead. His identity has not been released.

Witness Brian Gabriel said a man in a wheelchair started shooting.

"A gentleman that lives in building rolled up 8th floor to the workout room, rolled up to a guy on the treadmill, shot him in back of the head, wheeled himself out of building," Gabriel said.

Aaron Snyder said he saw a man in a wheelchair arguing with another man on a treadmill over a girl, though he "thought it was a joke." When he heard gunshots, he ran outside onto the pool deck, jumped over a fence and hid for 45 minutes.

"You go through a million things, don't know if someone is going to do a mass shooting or anything like that," Snyder said.



A heavy police presence could be seen at the residential apartment building.

Police do not have a suspect in custody, though Chicago Police Department spokesman Anthony Guglielmi said late Wednesday detectives know who he is.