There may be answers somewhere BUT:
If he was hated so much by the Saudis and knew it, why did he go into the Consulate without companions?
Why did his fiancee wait outside? Very strange.
Did he have an appointment, thereby alerting everyone in advance?
For a hit squad to arrive so soon there had to have been some pre-planning, weeks in advance surely?
What prevented his fiancee from going in to the consulate in order to check why he was taking so long, as any normal fiancee/wife would do?
Was the fiancee perhaps also a target?
Almost stranger than fiction!