A well-respected dentist along with his two teenage sons and an older brother were killed in a plane that crashed after departing from a regional airport near Roanoke.

A Beechcraft Bonanza, owned and operated by Dr. Leonard Ledet, 60, disappeared about 25 miles southeast of Terrel after it took off Saturday morning from the Northwest Regional Airport near Roanoke in Denton County, north of Dallas.

Lynn Lunsford of the Federal Aviation Administration said a search began after air traffic controllers lost radar and radio contact with the plane. A Texas Department of Safety helicopter that took part in the aerial search Saturday evening found the missing plane with the four dead victims inside.

On board were Leonard’s brother, Gregory Ledet, 62, and Leonard’s two sons, Paul Ledet, 17, a junior at Carroll Senior High School, and Mason Ledet, 13, an eighth-grader at Carroll Middle School.

They were en route to a Texas A&M football game over the weekend.

Leonard and Gregory grew up in Premont. Gregory worked with Leonard in his two dentist offices in Weslaco and Southlake.

The Federal Aviation Authority and the National Transportation Safety Board are investigating the cause of the crash.