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CONCORD, N.H. (AP) _ When Louis W. Joy III's corporate plane lifted off from Nashua Airport, flight officials thought it would head south toward New Jersey.

Instead, the single-engine plane went northwest.

Twelve miles later, in what witnesses said appeared to be a deliberate act, the plane went into a dive that slammed into the elegant home Joy, 43, shared with his wife and 8-year-old daughter in Amherst. The pilot was killed Saturday, but no one on the ground was injured.

No one was at the home, which was destroyed in an inferno that left only rubble above the basement.

The plane was registered to Joy's consulting company, Manufacturing Excellence Inc., based in Newark, Del. He had been president since 1987 and lectured on motivation and management. The company's Web site lists Fortune 500 companies as clients.

Authorities aren't sure who was at the controls of the plane, but suspect it was Joy, whose wife had obtained a restraining order against him the day before.

While investigators waited for dental records, they picked through the ashes and wreckage of Joy's home, his plane and his life _ searching for what might have driven the business executive to suicide.

On Monday, Judge William Drescher, who granted Jo Joy's restraining order, sealed the court documents in which she explained why she needed it and perhaps more clues to why Louis Joy is missing.

The wife couldn't be located for comment Monday by The Associated Press. Her lawyer, David Lauren, did not return a call seeking comment.

On Friday, Jo Joy went to Milford District Court for a restraining order against her husband. She got it. Late that night, neighbors said two police cruisers showed up at the family's home.

Neighbor Marie Seroskie said police officers escorted Louis Joy into the home to get his belongings. By then, Jo Joy and her daughter already were staying at a hotel.

While investigators waited Monday for the dental records from the crash, Jo Joy apparently needed no further proof.

``Based on information and belief ... respondent Louis Joy was killed when his airplane, which he was piloting, crashed into and destroyed the marital residence,'' she said in court papers filed Monday.

Originally from Long Island, N.Y., Louis Joy held a full-time job throughout his four years at Union College in Schenectady, N.Y., according to his fraternity brothers.

While at college, Joy met Jo, the woman he would marry shortly after graduation. From there he went on in 1983 to get a graduate degree in business from Duke University.

In 1987, Louis Joy founded Manufacturing Excellence.

In 1993, he and his wife wrote a novel together, ``Frontline Teamwork: One Company's Story of Success,'' which tells the story of a boss who rescues a struggling manufacturing company.

The Joys moved to Newark, Del., in the early 1990s. Wendy Hamme, who bought the couple's Delaware home in July 2000, said neighbors were glad when Louis Joy moved.

``He was very strange,'' she told the Boston Herald. She added that Joy, who worked from his home, was reclusive.

``He seemed like a charmer. But if he didn't get his way, he was nasty,'' she told The Union Leader of Manchester.

Last July, the Joys headed north to Amherst, a wealthy community of 12,500 people in southern New Hampshire. For much of the last year, the family lived in an apartment while their new home was completed.

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On the Net:

http://www.mfg-excellence.com