CNN's international security editor Nick Paton Walsh and a CNN team gained unusual access to the site where Iran's top nuclear scientist, Mohsen Fakhrizadeh, was assassinated in late November.
A witness recalled hearing an explosion and shooting.
Iran blamed the murder on remotely controlled weapons rather than on a group of killers.
The key question remains: what happens now? Would the government opt for diplomacy and wait for the inauguration of President-elect Joe Biden, or would the top brass go for retaliation?