A man has been struck down by a car and killed in a suspected domestic dispute outside a kindergarten.

The 32-year-old man had been seen walking alone and carrying a suitcase before he was hit by a car outside a Sunbury kindergarten in Melbourne's outer north-west early Sunday.

SES workers attend the scene in Sunbury. Credit:Patrick Herve

Police arrested a 29-year-old woman and questioned her over the incident.

She was charged with one count of murder late Sunday evening.