One person was killed and another injured in a traffic accident in Guthrie County Friday evening.  The Iowa State Patrol says 60 year old Kelly Jo Polson of Audubon died in the crash and 54 year old Andrew Leonard Knudsen of Sumter, South Carolina was taken by helicopter to Mercy Hospital in Des Moines with what were described as serious injuries.  According to the patrol report, Polson was westbound in her 2011 Ford Focus on Highway 44 west of Koala Avenue just before 10:00 pm and crossed the center line, stiking Knudsen’s 2023 Chevy Malibu head-on.  Polson was pronounced dead at the scene.  The crash is still under investigation.