HATFIELD — A South Hadley man was killed in a crash on I-91 Sunday, state police reported.

Daniel Ducharme, 31, was southbound on the interstate in Hatfield and lost control of his 2016 Honda Civic, for reasons that are still under investigation, police said. The car struck the guardrail multiple times and went off the roadway to the right, traveling down an embankment and striking several trees. Police were still trying to determine the time of the crash.

A passing motorist spotted the partially obscured vehicle in the woods just after 11 Sunday morning and called police.

State Police Northampton, State Police Collision Analysis and Reconstruction Section, the State Police Crime Scene Services Section, and the State Police Detective Unit for Hampshire/Franklin counties are continuing the investigation.