Two people have been arrested after a 25-year-old man died in an alleged hit-run crash in Adelaide's north.

Police said the man from Andrews Farm was struck by a car on Hillier Road, Hillier, just before 8pm on Tuesday before he was rushed to the hospital where he later died.

They alleged the involved vehicle failed to stop after the crash and left the scene.

Following investigations by Barossa Police, a 21-year-old Stockport woman was arrested on Wednesday and charged with cause death by dangerous driving and leaving the scene of an accident.

Police seized a Holden sedan for forensic examination.

They also arrested a 19-year-old Munno Para West man after a search of his home in the early hours of Wednesday morning allegedly uncovered a firearm in his bed.

The man has been charged wi

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