The Winnebago County Sheriff’s Office says a head-on crash this (Friday) morning involving a semi and a pickup truck has left one man dead in Winnebago County. Deputies say the wreck happened at around 5:30 A-M on Highway 44, between Oshkosh and Ripon. Investigators say the pickup crossed the center line and hit the semi-trailer head on. Deputies say firefighters had to clean up diesel fuel that had spilled on the road. The names of the drivers have not been released. the crash remains under investigation.