Family members told KTIV-TV the pilot was leaving Oshkosh, Wisconsin after an aviation event on Thursday.

ERIE, Colo. — A Colorado man was killed when the small plane he was piloting went down in a body of water in Iowa, family members said. 

The Federal Aviation Administration said the plane, a Zenith CH-64, crashed around 7:30 p.m. Friday near Sioux City, Iowa. 

Family members told KTIV-TV the pilot, 64-year-old Dennis Elkins, was leaving Oshkosh, Wisconsin after an aviation event on Thursday. When his family didn’t hear from him, they initiated a search, KTIV reports. A friend pinged the plane’s last known location and called authorities in Iowa, where investigators eventually found the plane in a body of water at a home near Lawton. 

Elkins’ family believes the plane, which Elkins built himself, may have gone down Thursday, KTIV reports. 

The FAA and National Transportation Safety Board are investigating the crash.