Metra NCS said inbound and outbound trains were stopped near River Grove at about 2 p.m.
Train #105 struck a pedestrian between the Hanson Park and Galewood stations, Metra said.
A Metra spokesperson confirmed the pedestrian died.
Trains began moving with extensive delays by 3:30 p.m. on Monday.
Metra Milwaukee District West trains were also impacted by the delays.
No other information was available.