Man killed in crash on Sprain Brook Parkway in Greenburgh

Police say a man died before crashing his vehicle into a guardrail in Greenburgh.
The incident happened at around 4 a.m. Saturday on the southbound side of the Sprain Brook Parkway.
Police say the driver lost control of his car and slammed into a guardrail near the Underhill Road overpass.
Investigators say the man died of a possible heart attack or stroke.