It's not going to be a surprise to anyone that Julian Assange has become a classic paranoid, especially given the business he has chosen for himself.    You don't publish stolen secret documents without worrying a little - or a lot.

Now he is worried that if the UK extradites him to the US for espionage he will be 
killed "Jack Ruby-style" - a reference to the man who killed Lee Harvey Oswald before he could stand trial for the murder of President John F Kennedy.
The Kennedy assassination and then-murder of his shooter has been fodder for conspiracy theorists since it happened in 1963.

Oddly, The Telegraph, published in the country that basically invented the English language, calls the shooting of Kennedy a murder but the shooting of Oswald by Ruby an assassination, when in fact those terms should be transposed.   No wonder Assange chose to tell them his fears about being...well, what would he be, murdered or assassinated or crucified?

Assange is hoping to mobilize popular support in the UK, as if that makes a difference in whether governments extradite someone for espionage or not.     He may get it - it isn't like he leaked details about the Queen or anything.

More likely he will be extradited to Sweden to stand trial for the charges against him, though he contends the women who filed charges against him are part of the Vast, Right Wing Conspiracy that everyone else who dislikes him must be in.