Anchorage, Alaska (KINY) Michelangelo Canale, 50, had been accused by at least two ex-students of systematic sexual misconduct.
KTVA News reported that Assistant District Attorney Andrew Grannik said the state would be unable to prove the case beyond a reasonable doubt.
Two students accused Mr. Canale of touching them inappropriately, and with making inappropriate comments. The Anchorage Classical Ballet Academy Board of Directors placed Canale on administrative leave when Anchorage police announced an investigation.
The Academy has lost between 25 and 30 percent of its enrollment since the allegations were made public.