The small plane went down in a field in near the Crater Lake-Klamath Regional Airport in the area of the Southside Bypass and Homedale Road around 10:30 a.m. Wednesday.
OSP troopers have secured the scene until Federal Aviation Administration officials arrive.
The deceased pilot of the plane was identified by deputies as 79-year-old Klamath Falls resident Abraham “Dutch” Van Rood.
The Klamath County Sheriff’s Office said the airplane was registered as “experimental.”
Witnesses told police the plane was flying erratically moments before the crash.
NBC5 News will update this story as more information becomes available.