Military Attache Col Joseph Emanuel Hall, who killed a motorcyclist in Islamabad, left Pakistan on Monday evening, the United States (US) embassy confirmed.
Relations between Washington and Islamabad have been strained since US President Donald Trump accused Pakistan of "lies and deceit" and criticised Islamabad for providing safe havens to terror groups.
A State Department spokesperson told Reuters that the diplomat who was involved in the April 7 crash in Islamabad has departed the country. It was added that the local police have handed over all relevant record to the U.S. officials. However, an Islamabad court had ruled earlier that Col Hall's diplomatic immunity did not protect him in the case, as per media reports.
On Saturday, the authorities in Pakistan prevented the Colonel Hall, from flying out of the country.
Pakistani officials had been demanding that the United States waive Col Hall's diplomatic immunity, but U.S. officials refused.
The Islamabad High Court had also heard a petition by Ateeq's father seeking the placement of the diplomat's name on the Exit Control List (ECL). The matter was also discussed during the last visit of United States official Alice Wells.
After registering a protest over the accident last month, authorities in Islamabad blocked Hall on May 12 from leaving Pakistan, forcing a USA military aircraft sent on his behalf to depart without him.
In August 2017, Trump accused Pakistan of providing safe havens to militants fighting USA forces in Afghanistan, a charge Islamabad denied.