Meyer was placed on paid administrative leave Wednesday after the ex-wife of former Ohio State assistant coach Zach Smith said in an interview she had been in repeated contact in 2015 with Meyer's wife regarding alleged abuse by her then-husband.
An Ohio native, he flew in from Myrtle Beach, South Carolina, to lead a demonstration in support of Meyer at Ohio Stadium.
The school announced on Sunday night that its investigation will be completed within two weeks while Meyer remains on paid leave.
The 2015 allegation happened while Zach Smith was at Ohio State and he told multiple media outlets last week that he was on the road recruiting and was told by Ohio State athletic director Gene Smith to come back to Columbus after the accusation was made to police.
The committee's investigative team will be led by former chair of the U.S. Securities and Exchange Commission Mary Jo White, a senior chair with the law firm Debevoise & Plimpton and a former U.S. Attorney for the Southern District of NY.
The first half hour of the Buckeyes' fourth practice was open for observation and photography, with acting coach Ryan Day staying at the far end of the practice field working with quarterbacks. He was never charged.More news: Critics of Israel's Nation-State Law Misunderstand the Country's Constitutional System
Stacy Elliott spoke fervently in favor of Meyer.
Ohio State is investigating how Meyer handled the complaint.
Julia Leveridge released a statement Monday that read, in part, that "while The Ohio State University has never contracted Ms. Smith to discuss these allegations, she will fully cooperate with the university's current investigation".
What Meyer knew and when he knew it became a question after college football writer Brett McMurphy reported that Courtney Smith had told Meyer's wife Shelley about the 2015 incidents and shared pictures of injuries through text messages that she shared with McMurphy.
Meyer initially denied that he knew anything about the 2015 accusation before issuing a statement Friday that reversed course. He also admitted lying to reporters about it.
Meyer has gone 73-8 in six seasons at Ohio State, including a national championship in 2014 and two Big Ten titles after winning a pair of national titles at Florida.