If he pleads down and doesn't get jail time, the charge will be reduced to something less than dui.
If that happens the prosecutor will take considerable heat because the police initially reported that Williams tested at almost 2X the legal limit (.15 BAC versus .08 legal limit). The State's prosecutor has already decided to formally charge the less serious misdemeanor DUI .08 instead of the aggravated DUI .15 which is itself a break for Williams because it avoids the felony charge. Dismissing the DUI charge altogether under these alleged facts would be highly irregular. I can only imagine the public backlash.
Even if the prosecutor agreed to a deal which dismisses the 3rd DUI charge, I assume the Judge could either (a) reject the plea deal or (b) accept the plea but decide to impose a stricter sentence than agreed to between Williams and the prosecutor. Plea deals include sentence
recommendations. Only a Judge can impose a sentence. Not sure about Nebraska but in a number of states, Judges have the discretion to accept the plea deal without being bound by the sentence recommendation. This route is risky because it places the defendant in jeopardy of incarceration and it relies on the mercy of the court.
If Nebraska law allows it, one way out for Williams may be a suspended imposition of sentence. Under that type of arrangement, the judge could accept a guilty plea to the misdemeanor DUI charge, impose a sentence which includes jail time but then suspends the jail time with conditions which would include, for example, completion of treatment, payment of fine, and no other criminal offenses for a set term of years. In the end, that may end up being the best legal option if NE law permits it and the Judge agrees that it is an appropriate judgment in this case. This route avoids jail time but the defendant is left with a 3rd DUI conviction on his record.