Police in Gilroy are searching for a woman who caused a 56-year old man to be airlifted to a San Jose trauma center after a hit-and-run incident last night . The man was struck just before 11 p.m. while he was walking across First Street between Rosanna and Hanna Streets. Police say the unknown woman was driving the vehicle, which has been described as a grey, or silver vehicle, possibly a Honda. The woman left the area without stopping, and was last seen driving south on Church Street from First Street. Anyone with any information is asked to contact Gilroy Police.