Human Rights are rights you get by being human. Not by being a good human, but by being human. They apply to both the good and the bad.
The deceased person had his human rights breached, which is why his murderer was imprisoned.
The real debate is what should these human rights be. Is a family life a human right, or is it a privilege that can be forfeit by some?
We need to be more careful about what we define as rights and what we define as privileges. Those things we call human rights should apply to all - good or bad, deserving or not.
There will always be individuals who violate the human rights of others and we punish them for it. Nations and organisations must not be allowed to violate those rights.
If a criminal is denied human rights by a government, it is no excuse to say "well, he violated his victim's human rights". As already pointed out, two wrongs etc.....
EDIT: I tried to answer without direct reference to the Philip Lawrence murderer, as the questioner didn't mention it, but it is, of course, very relevant.
The principle of deporting foreign prisoners after sentence is served is a good and fair one. But as the criminal concerned, while holding an Italian passport, has been brought up in this country and has no links to Italy, it does not seem just to deport him. Why does he deserve justice? Because we play by the rules, which is what gives us the right and the authority to punish those who don't.
Just to correct a couple of errors - this murderer has currently served 11 years (not 2 or 3 years as stated below) and is allowed to ask for parole next year, after 12 years. This does not mean he will be released - indeed, the furore that this case has created may well make it unsafe to release him. This is unfortunate - I have no desire to see him released, but I think it's wrong that the reason for his continued detention be fear of the lynch mob.
I stick by my original premise - human rights are for everyone, not just the good. Perhaps this means we need to be more careful about what we define as 'rights'.
MORE EDIT:
In response to Redmonk - If you read my answer a little more carefully, I did say I don't want to see this murderer released. But you talk about compensation to the dead man's family. No, 11 years is no compensation - but nor would 110 years be, nor would a hanging be. Nothing will compensate Frances Lawrence and her children and arguing about the length of sentence is spurious.
I would normally agree with you - deport foreign nationals on completion of sentence. But this case is exceptional, both in the gravity of the crime and the status of the criminal. His official citizenship is based on a long departed father with no contact. His upbringing is British. This is not a casual immigrant - it is someone who did not choose to come to this country and who knows no other country. It would be no more appropriate to deport him to Italy than it would to deport Ronnie Biggs to Italy if we let him out.