A pedestrian has died and a rider has been arrested after an e-bike crash in Sydney's west.

The 65-year-old pedestrian was hit by the e-bike near Greenmeadows Crescent in Toongabbie just before 10pm on Wednesday night.

He was taken to Westmead Hospital in a critical condition, but died yesterday, police said.

Police allege the rider of the e-bike fled the scene of the accident.

An investigation led police to arrest a 45-year-old man in Seven Hills yesterday.

He was taken to Blacktown Police Station, however, he has since been released without charge pending further inquiries.

Anyone with information or dashcam footage is urged to contact Parramatta Police or Crime Stoppers on 1800 333 000.

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