"We appreciate and thank Tre for his contributions to our football program both on and off the field," Indiana coach Kevin Wilson said in a statement. "He is an outstanding player and a great young man. We wish him well as he moves forward with his career."
Roberson threw for 1,128 yards and 15 touchdowns last season for the Hoosiers, including a record-setting performance against Purdue in which he completed 25-of-37 passes for 273 yards and six touchdowns. He was 83-for-138 -- a completion percentage of 60 percent -- with only four interceptions.
Roberson also rushed for 423 yards and five touchdowns on 85 attempts last season, an average of five yards per carry.
"I want to thank the coaching staff, my teammates and Indiana University for all of their support over the last three years," Roberson said in a statement. "My time in Bloomington will always hold a special place in my heart. I wish everyone at IU all the best as I move on to the next chapter in my life."
Roberson became the first ever true freshman to start at quarterback for Indiana back in 2011, a year after he was named Mr. Football in the state of Indiana while playing at Lawrence Central High School. Roberson threw for 937 yards that season.
He returned as the team's starter in 2012, but suffered a broken leg in the second game of the season that forced him out for the year. He was off to a great start, having thrown for 368 yards and having run for 133 more in less than two games.
Despite his success, though, Roberson was also in a quarterback battle with Nate Sudfeld, and the two have split time for the last three seasons. Wilson has regularly used a two-quarterback approach since both players have different strengths, and that was likely to continue into next season.
It's purely speculation, but being the primary quarterback elsewhere would be the obvious reason Roberson has decided to transfer elsewhere.
He took to Twitter after the news broke on Wednesday afternoon to thank everybody for their support.
"I want to thank Hoosier nation for all the support the last 3 years," he wrote. "I'm going to miss my teammates more than anything. I love them all."
Roberson's decision is a surprising one that seemingly came out of nowhere, but all is certainly not lost for Indiana. Wilson's decision just became a whole lot easier, and Sudfeld should benefit from knowing the job is his and not having to look over his shoulder anymore.
We will have more on this story as it develops.