Jagger said that an on-ice official heard the slur and gave the opposing player a game misconduct. The only player who received a misconduct in that game was Ohio State forward Kamil Sadlocha, in the second period.
Jagger in his tweet expressed displeasure that there's been no public action by Ohio State or the Big Ten following their investigation of the alleged incident.
"The inaction has left me feeling confused and pessimistic about the movement of diversity within hockey culture," he said. "The ignorance of racism does not belong in our game, and I feel that I need to make people aware that this incident occurred because without acknowledgement, the problem gets worse."
In a statement to the Wisconsin State Journal, the Big Ten said that it collected and evaluated information from the conference's officiating crew, Ohio State and Michigan State, along with available video footage.
"Due to the absence of indisputable evidence presented to the conference, the conference has not imposed further disciplinary action," the statement said.
Ohio State issued a statement Monday night saying that its Department of Athletics and men's hockey program "worked collaboratively with the Big Ten to come to a resolution in response to the allegation of misconduct toward the Big Ten sportsmanship policy."
But late Tuesday, Ohio State director of athletics Gene Smith issued a statement apologizing to Joshua and said that Sadlocha "is returning home and will not practice or compete with the team."
He also said the hockey team will "complete education on racial sensitivity, diverstiy, equity, inclusion and the use of respectful dialog."
NHL.com independent correspondent Kevin Woodley contributed to this report