If the IRS has a lein against you for back taxes, does it ever expire, and what happens if you die?

It expires when its paid. If you die its applied to your estate.

I am a little confused, as I found this article.
IRS Statute of Limitations: Do Taxes Ever Expire? (http://ezinearticles.com/?IRS-Statute-of-Limitations:-Do-Taxes-Ever-Expire?&id=52707)
It states that that the IRS has 10 years?

Well looks like I was wrong. Sorry about that. Generally a debt never expires, so I assumed that applied to tax debt as well.

Generally the time frame for collections is 10 years from the date the tax is assessed. A copy of the lien should show the date the tax was assessed. The date you file the return is not the date the tax is assessed.