The apparent executioner assured him on March 31 "[w]e know where he is" and later chatted "[your] problem has been taken care of... he won't be blackmailing anyone again. Ever."
Ulbricht allegedly responded on April 5: "I've received the picture and deleted it. Thank you again for your swift action."
The FBI admits it wasn't able to locate anyone by the name or description of the apparent victim in British Columbia and said Canadian police are not aware of any unsolved murders around March 31.
The murder mystery introduces fresh confusion after the long-mysterious identify of Silk Road's operator was allegedly unveiled.
A civil forfeiture complaint says there were nearly 13,000 listings for illegal drugs on Silk Road as of Sept. 20. An August 2012 study by Carnegie Mellon University computer scientist Nicolas Christin pegged illegal drug sales on Silk Road at around $2 million a month. As with some other online marketplaces, the site took a cut of proceeds.
Since November 2011, that complaint says, law enforcement agents made 100 undercover drug purchases via Silk Road. Postal marks showed the vendors were based in 10 countries and sold high-purity ecstasy, cocaine, heroin and LSD.
Read the criminal complaint: