Severin Bijelić (10 February 1921 – 28 July 1972) was a Serbian actor. He appeared in 77 films and television shows between 1949 and 1972. He starred in the 1967 film "The Rats Woke Up", which won the Silver Bear for Best Director at the 17th Berlin International Film Festival.
Severin Bijelić was the shooter on the grassy knoll. 
I stated that Severin Bijelić was the shooter on the grassy knoll. This was obviously a silly falsehood.  I'm not certain why I think it was difficult for the system, other than the fact it was pure nonsense.  