American blues guitarist Stevie Ray Vaughan and four others. 1991 October 25 – Bill Graham and two other people were killed when their Bell 206 crashed in poor weather west of Vallejo, California. 1993 April 19 – After a propeller blade separation during cruise, a Mitsubishi MU-2B-60 crashed into a farm silo in low visibility about south of Dubuque, Iowa, killing Governor of South Dakota George S. Mickelson and seven others. Later that April, investigators' findings prompted the U.S. Federal Aviation Administration (FAA) to order the immediate inspection of Hartzell propellers similar to those on the accident aircraft. The accident was attributed to metal fatigue of the propeller hub caused by improper design and manufacturing. 1996 April 11 – Cessna 177B, N35207. Jessica Dubroff, a seven-year-old pilot trainee who was attempting to become the youngest person to fly an airplane across the United States, died when her aircraft crashed after takeoff from Cheyenne Regional Airport in Cheyenne, Wyoming. December 24 – A Learjet 35A crashed near Lebanon, New Hampshire which led to the longest missing aircraft search in that state's history, lasting almost three years. 1997 October 12 – singer-songwriter John Denver was killed when the Long-EZ aircraft he was piloting crashed just off the coast of California at Pacific Grove, California, shortly after taking off from the Monterey Peninsula Airport. 1999 March 23 – Stanford graduate and multi-talented test pilot for Cirrus Aircraft, Scott D. Anderson, was killed in a plane crash while flight-testing the Cirrus SR20 before it went on sale. The problem occurred when his plane experienced an aileron jam during experimental stress-testing. He went down in the yard of a prison approximately 400 meters from the Duluth International Airport. July 16 – John F. Kennedy Jr and passengers, wife Carolyn Bessette and sister-in-law Lauren Bessette, were killed when the Piper PA-32R-301 Saratoga II he was piloting, registration number N9253N, crashed into the Atlantic Ocean during a flight from Fairfield Township, Essex County, New Jersey bound for Martha's Vineyard, Massachusetts. The National Transportation Safety Board determined the crash was caused by: "the pilot's failure to maintain control of the airplane during a descent over water at night, which was a result of spatial disorientation". August 7 – Pulitzer Prize–winning publisher Ted Natt boarded a helicopter from Oysterville, Washington to Kelso, Washington, which later crashed six miles east of Knappa, Oregon. The crash was not discovered until September