London ? After six months and almost 250 witnesses, the latest multimillion-dollar government investigation into the death of Princess Diana ended Monday with a jury concluding that her death was caused by the gross negligence of her speeding driver and pursuing paparazzi.

The jury found that Diana’s chauffeur, Henri Paul, who had been drinking, and the photographers chasing her car into a Paris tunnel caused her “unlawful death,” which is similar to manslaughter.

Two previous police investigations – one French, one British – concluded that the deaths were a tragic accident caused by reckless driving by Paul, who was racing away from the photographers. British taxpayers have paid more than $20 million for investigations into Diana’s death.

Legal experts said it was possible but unlikely that this verdict could lead to further legal action against the paparazzi in the Aug. 31, 1997, crash. Paul and Diana’s companion, Dodi al-Fayed, also died in the crash.

Princes William and Harry issued a statement that said they “agreed” with the verdicts and thanked the jury for its “thorough” work. They also expressed their “most profound gratitude to all those who fought so desperately to save our mother’s life on that tragic night.”