The crash happened around 2:47 a.m. in the 200 block of South Larkin Avenue in Joliet, police said.
A 56-year-old man was riding a bicycle when he was involved in a crash with a vehicle that then fled the scene, police said.
Officers found the man next to his bicycle. He was taken to a local hospital by the fire department, and he was later pronounced dead.
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The victim's identity was not immediately known.
The suspect's vehicle has not yet been located. Joliet police continue to investigate.