His detailed tip helped lead investigators to the gunman behind the deadly Brown University shooting – but whether the tipster known only as “John” will ever receive the $50,000 reward offered by the FBI is still an open question.

Authorities say the Brown University mass shooting suspect, 48-year-old Portuguese national Claudio Manuel Neves-Valente, is also responsible for the murder of MIT professor Nuno Loureiro. Neves-Valente was found dead in a New Hampshire storage unit from a self-inflicted gunshot wound.