A former staffer at a Big Ten football program has told the Associated Press that he was a sign-stealer and helped compile a spreadsheet of Michigan’s calls.

The AP’s Larry Lage describes the anonymous source as a former employee at a Big Ten football program. Per Lage, the source recently showed the spreadsheet and text message with staffers at other B1G schools to Michigan.

The anonymous former staffer was motivated to act by the investigations into Michigan’s alleged sign-stealing operation:

He also said gave the details to Michigan last week because he hoped it would help Jim Harbaugh’s embattled program and he believes Harbaugh and his coaches are being unfairly blamed for the actions of a rogue staffer.

Sign-stealing is not against NCAA rules, but the Big Ten could potentially punish teams for violating the conference’s sportsmanship policy. The depth of Michigan’s alleged operation has led to investigations of the Wolverines by the B1G and the NCAA.

Connor Stalions has emerged as the central figure in the Michigan sign-stealing scandal. Stalions is tied to ticket purchases for games of numerous future U-M opponents, as well as teams the Wolverines would potentially play in the postseason. According to a Washington Post report, Salions’ operation had a season budget of over $15,000 for travel and tickets to over 40 games.

Stalions reportedly sent game tickets to those who would film a team’s sideline from the stands. Collected footage was copied to hard drives that were shared with other Michigan assistants. In-person scouting of future opponents is not allowed under NCAA rules.

Stalions resigned from his position at Michigan last week.