Police are searching for the hit-and-run driver who police say fatally struck a man and left another seriously injured in Holtsville.  

Police say Ryan Walker and Robert Kehlenbeck were working on a pickup truck outside Walker’s home on Express Drive South when they were struck Wednesday night.  

Walker ,37, was transported to the hospital where he was pronounced dead.

Kehlenbeck is being treated for serious injuries at Stony Brook Hospital. 

Anyone with information is asked to call police.