It is often said, and I have discussed it here many times, that prosecutors rarely face accountability for prosecutorial misconduct. Yet, every now and then courts do take action. In 2013, I wrote a number of posts about the ex-prosecutor (later judge) in Texas who was disbarred for having lied during an investigation on whether he withheld exculpatory evidence in a case that resulted in the conviction of an innocent man. See here for the most recent post on that case, with links to others.
Similarly, another former Texas prosecutor was disbarred this week for withholding evidence and presenting false evidence in a case that resulted in the conviction of an innocent man. The defendant in that case served 18 years and twice was scheduled for execution before he was exonerated and released four years ago. Go here for an article with more information.