I want to know the answer to the following question:
On what date did NATO kill Gaddafi's son?
All the background I'm provided with is that "U.S. Secretary of Defense Robert Gates said that NATO was "not targeting Gaddafi specifically" but that his command-and-control facilities were legitimate targets—including a facility inside his sprawling Tripoli compound that was hit with airstrikes on 25 April.". Is that enough to answer the question?