It happened around 9:10 p.m. Monday, Oct. 28, in North Amityville.
The 17-year-old was walking westbound across New Highway at the intersection of Pine Road when he was struck by a 2007 Toyota Prius traveling southbound, according to Suffolk County Police.
The boy, a resident of North Amityville, was transported to Good Samaritan University Hospital in West Islip with critical injuries.
The driver of the Toyota, a 45-year-old Brentwood woman, was not injured.
Detectives are asking anyone with information of the crash to contact the Suffolk County PD First Squad at 631-854-8152.
Check back to Daily Voice for updates.
Click here to follow Daily Voice Huntington and receive free news updates.