What happens to Murellus and Flavius?

Casca explains to Brutus and Cassius that “Murellus and Flavius, for pulling scarfs off Caesar’s images, are put to silence.” Interpretations of this line vary. There is the obvious euphemistic interpretation that silence means death, suggesting Caesar had the two tribunes killed for speaking out against him in public. Yet other theories suggest that the pair may have been stripped of rank and possibly tortured, having their tongues cut out, or that they were simply threatened, stripped of rank, and forced to stop publicly opposing Caesar.