Much much faster than what these hobbyist pilots are used to. This causes "the plane to get in front of them", and for them to crash.

Probably the most common nickname the Bonanza V-tail is known for is being the “doctor killer.” When the Bonanza was first introduced, it was unlike anything anyone has ever seen in the general aviation market. The V-35 Bonanza is called the Fork-Tailed Doctor Killer. The Bonanza series is collectively referred to as the Doctor Killer. There are a few airplanes like this. The “Doctor Killer” got it’s reputation from being too much aircraft for an amateur pilot. And for the decade following its release, successful businessmen and professionals were buying the Bonanza in great numbers. ;) ( i.imgur.com ) submitted 4 years ago by cornbreadz In fact, that spate of accidents was part of the reason for the creation of the Beechcraft Pilot Proficiency Program (BPPP) in 1983 by the American Bonanza Society. are sometimes referred to as Mooney Drivers. There is a plane called a Beech Bonanza that is nicknamed "The doctor killer." The Beechcraft Bonanza is a radical design, low-wing, fixed landing gear aircraft with a signature V-tail introduced in 1947 by the Beech Aircraft Corporation of Wichita, Kansas. New (to us) V-tail Beechcraft Bonanza that was donated to my A&P school over the winter break and is now ready to be student-ized!

It gets this name because it 's a single engine plane, which attracts wealthy hobbyist pilots (like doctors) but it's fast. It is currently still in production by Hawker Beechcraft.
It gained that name decades ago following a spate of high-profile crashes, with many of the pilots doctors. Doctors (M.D.)

"The Doctor Killer".

kwantam on Nov 22, 2010. While the Beechcraft Bonanza has a loyal following, it also has an infamous moniker: The Doctor Killer.