Two men were killed in separate pedestrian accidents little more than an hour apart Wednesday night in Suffolk County, police said.

One fatal crash occurred in Oakdale at 8:14 p.m., the other in Selden at 9:30 p.m., Suffolk County police said.

In each case, the driver remained at the scene and was not charged, police said.

Police identified the victim in the first crash as John O'Brien, 65, of Oakdale.

The victim in the second crash was identified Thursday afternoon afternoon as Timothy Blake, 53, of Medford.

In the Oakdale crash, police said O'Brien was crossing Montauk Highway in front of the Lighthouse Commons Shopping Center, just west of Berard Boulevard, when he was struck by a westbound 2002 Hyundai Elantra driven by Jonathan Singh, 19, of Port Jefferson Station. Singh was not hurt in the crash.

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O'Brien was taken in "traumatic arrest" to Southside Hospital in Bay Shore via Community Ambulance of Sayville, but was pronounced dead.

Police said the investigation was continuing Thursday.

The probe also continues in the second fatal crash, which occurred on County Road 83 in Selden. In that crash, police said Blake was "in the middle of the roadway" when he was struck by a northbound 2012 Nissan driven by Melanie Purcell, 64, of Port Jefferson Station.

Police said Blake was taken by Selden Fire Department Ambulance to Stony Brook University Hospital, where he was pronounced dead. The Nissan was impounded for a safety check.

Police ask anyone with information about either crash to call Crime Stoppers at 800-220-TIPS or detectives -- the Fifth Squad at 631-854-8552 for the Oakdale crash, the Sixth `at 631-854-8652 for the Selden crash.