Traffic will be slowed or diverted in Ronkonkoma on Monday due to funeral services for a Nassau County police officer who was killed Thursday as he investigated a car crash on the LIE, Suffolk County police said.

Police said Ronkonkoma Avenue, Hawkins Avenue and Pond Road between County Road 16 and Express Drive North will be subject to periodic closures between 9 a.m. and 2 p.m. for the funeral of Officer Joseph Olivieri.

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Police also advised motorists to avoid the area due to heavier than normal traffic.

Olivieri died after he was struck by a sport utility vehicle as he investigated a crash on the Long Island Expressway in North Hills. The driver he was assisting at the time, James Ryan, 25, of Oakdale, faces among other charges, vehicular manslaughter and driving while intoxicated. The SUV driver has not been charged.

The funeral Mass will take place at 1 p.m. Monday at St. Joseph Catholic Church in Ronkonkoma, followed by burial at Holy Sepulchre Cemetery in Coram. There is a wake for him Sunday from 2 to 4 p.m., and 7 to 9 p.m. at the Ronkonkoma Fire Department.