The _murderer's_ rights aren't violated by people knowing what they did. They should have been executed anyways. But irrelevant of that, non-aggressive people also have the right of freedom of association. I for one choose not to associate with people I consider dangerous.
In a free society, criminals would owe restitution to their victims, and victims would be also entitled to request retribution against the criminal. Then people at large could make their own associative or dis-associative decisions regarding the criminal.
One thing is clear, however. It doesn't violate anyone's rights for other people to know information about them that they've made publicly available through their actions.
Note that I'm not saying I have, per se, the right to know information about other people. That would imply positive obligations on the part of other people. However, no-one has the right to stop the various people at Wikipedia from recording and maintaining an account of history. That is their private property right.