(AP) — A hung jury has led a judge to declare a mistrial in the case of a former Ralston teacher accused of inappropriately touching young students.

Prosecutors must now decide whether to retry 59-year-old Nicholas Richter on four counts of third-degree sexual assault of a child. A jury had deliberated for about 14 hours Friday, Monday and Tuesday before informing the judge that members were deadlocked.

Four boys ranging in age from 10 to 12 testified in the trial that Richter groped them during classes. A 40-year-old man also testified that Richter groped him three decades ago.

Richter’s attorney had described the testimony as consisting of “inconsistent and inaccurate memories.”