Suffolk County police say 32-year-old Damien O'Brien, of East Moriches, turned himself in Wednesday night.
Last week, police armed with a search warrant seized computers, CDs and DVDs they say contained large amounts of child pornography.
An officer with the computer crimes unit says they became aware of the suspect by monitoring internet activity.
WAKE UP WITH EYEWITNESS NEWS! Click here to download the WABC Eyewitness News Alarm Clock app from iTunes. or search WABC or 7online in the app store.
Get Eyewitness News Delivered