I remember hearing about a criminal who had admitted to officials in
prison that if he was released he would commit another crime.  He was
later given a parole hearing and was given parole.  Do you have the
name of this criminal or a link to the case?

I'm sure there are *many* who would meet your criteria.
This beauty apparently told prison staff that he wanted to be Canada's
most prolific serial killer. Towering 6 foot 5 inches and 280 pounds
he could intimidate.  Having never actually been sentenced to more
than 10 years at a stretch he was not eligible to be classified by a
judge as a "Dangerous Offender" under the Canadian Criminal Code. 
While not as definite as "life without parole" it could theoretically
be used to detain for life so long as periodic parole hearings do not
spring him out.

http://www.theglobeandmail.com/servlet/ArticleNews/TPStory/LAC/20040709/EFERRIER09/TPComment/Editorials

The inmate was named Martin Ferrier.
Here is another link.
http://www.thestar.com/NASApp/cs/ContentServer?pagename=thestar/Layout/Article_Type1&c=Article&cid=1089151404352&call_pageid=968332188492&col=968705899037

The working name for a proposed new Canadian Criminal Code statute is the
"61 strikes and you're out" law.