A man was killed by a "bullet from his own gun" on the roof of a Midtown building at 30 East 40th Street. The police say the man, who was found with "rope, a hacksaw and three Dell laptops in the intruder's backpack," may be a man with a number of burglary and stolen property arrests. A building employee called the police after discovering a break-in. Superintendent Joe Aguasviva told the Daily News he had......