Officers responded at about 9:27 p.m. to a crash between a car and a bicyclist at the intersection of Rohlwing Road and Campbell Street.
Officers arrived and found a man who was riding the bicycle down on the roadway but conscious, police said.
The man was transported to a hospital and was later pronounced dead, police said. He has been identified as Patrick J. Houlihan, 41, of Rolling Meadows, police said.
Rolling Meadows police said the driver who allegedly hit Houlihan may have left the scene....but came back a "short time later." However, investigators say the crash is not being investigated as a hit-and-run and police said the driver is cooperating.
The crash is currently being investigated by the Rolling Meadows Police Department with assistance from the Major Case Assistance Team's (MCAT) Serious Traffic Accident Reconstruction (STAR) Team.