A Spring Hill man was killed in a head-on Hernando County crash on Friday after one driver entered the oncoming lane, authorities said.A Nissan Altima, driven by a 19-year-old Spring Hill man, was traveling westbound on Northcliffe Boulevard at about 9:45 p.m.The second vehicle, a Chevy Malibu, driven by a 61-year-old Spring Hill woman, was eastbound on Northcliff Boulevard.According to A Florida Highway Patrol report, for an unknown reason, the Altima drifted across the roadway, east of Merchant Avenue, and into the path of the Malibu.The two vehicles then collided head-on, causing serious injuries to both drivers, the report stated.A passenger traveling in the Malibu, a 35-year-old Spring Hill man, was also seriously injured during the collision.All three were taken to an area hospital where the passenger was later pronounced dead.