A Door County woman was one of two people who was killed in a one car crash Friday evening in Sheboygan County. 58 year old Heidi Martiny of Forestville died when the vehicle she was traveling in on I-43, near the Village of Kohler, left the roadway and collided with a tree. 20 old Shawnee Silas-Grode of Green Bay also died in the traffic accident. According to authorities, the highway was snow-covered and slippery at the time of the collision. Two other occupants of the vehicle sustained injuries in the crash which remains under investigation.