A motorcycle accident with a serious injury closed westbound Middle...

A motorcycle accident with a serious injury closed westbound Middle Country Road in Lake Grove Monday, Aug. 18, 2014, Suffolk County police said. Credit: Chris sabella

A motorcyclist was in critical condition after hitting the back of a pickup truck Monday morning in Lake Grove, Suffolk police said.

Mark Ammirati, 49, of Selden, was on his Yamaha going west on Middle Country Road near Hawkins Avenue when he slammed into the back of a Toyota pickup truck just before 10:14 a.m., a crash that shut down westbound lanes for more than three hours, police said.

Witnesses said the pickup was stopped at the red light at the intersection with Hawkins Avenue, and why Ammirati did not stop was not immediately clear, said Det. Sgt. Dean Joseph of the Fourth Precinct.

"They said everybody was stopped and he's just moving," Joseph said.

Ammirati was taken to Stony Brook University Hospital, police said. The pickup driver was not injured, police said.

The westbound lanes were reopened at about 1:35 p.m., police said.

Both vehicles were impounded for safety checks and the investigation continues, police said.

Detectives ask anyone with information to contact them at 631-854-8452.

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New hope for justice Theresa Cerney's killing is one of at least 66 cases of dead women being reviewed by Suffolk County District Attorney Raymond Tierney's new cold case unit. NewsdayTV's Shari Einhorn and Newsday investigative reporter Sandra Peddie have this exclusive story. 

Theresa Cerney’s killing is one of at least 66 cases of dead women being reviewed by Suffolk County District Attorney Raymond Tierney’s new cold case unit. NewsdayTV's Shari Einhorn and Newsday investigative reporter Sandra Peddie have this exclusive story. 

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