Who killed Jesus?

I came across this interesting analysis on the new $30 million Mel Gibson's production. I felt curiosity about this movie, as some said that the movie takes you though cruel and violent moments. Obviously, it is not a film to entertain, but to recreate the suffering of Jesus, and does not have the common historical take that other movies take on this theme. What is left to our judgment is the answer to the old question, who killed Jesus: Romans or Jews?