JFK Jr.

Many elements suggest that his death in a plane crash had not been an accident. Several witnesses testified having heard or seen his plane explode. 

The official report stated that its sudden and steep fall cannot be explained as pilots error.

On the order of president Clinton, the rescue and recovery missions were conducted under national security conditions by the Navy, and the investigation was supervised by the same people in the national transportation board who had falsified the investigation on TWA800. 

Once the bodies were uncovered, no autopsy was conducted. They were cremated in a Navy ceremony, although this is not in the tradition of either families, and its more likely that he would have proffered to have been buried next to his father.

Why

In December 1996 John's political magazine, George, was the only mainstream magazine exploring the inconsistencies of the official report on the explosion of flight TWA800. The national transportation safety board claimed it was an accident, although 375 witnesses saw one or two bright flair objects hit the plain, many of them believing it was a missile. Israeli intelligence had tried to put the blame on an Iranian missile but some investigators believed this was a failed Israeli false flag attack designed to force the united states into retaliating against Iran. 

George also published an article by the mother of Yigal Amir, the man convicted of assassinating Israeli prime minister yitzhak rabin, claiming that her son had been manipulated by Israeli deep state operatives. 

According to testimonies from his friends, John Jr was knowledgeable about independent investigations on his father's death. In October 1998 John Kennedy Jr. released a special conspiracy issue of George magazine which included an article by Oliver Stone. 

At age 39 John was preparing his entry into politics and he was about to announce it publicly. He had also expressed to his friends his ambition to ultimately reach for the presidency. According to some he would have aimed for the seat of governor in 2003. According to others he had decided to run for the New York senate seat in 2000.