Etling played two years at Purdue and, after sitting out the 2015 football season, will have two years of eligibility left at LSU.
In 2013, Etling threw for 1,690 yards, 10 touchdowns and seven interceptions. Last year, the Terre Haute, Indiana native threw for 800 yards, six touchdowns and five interceptions.
With the addition of Etling, LSU will have four scholarship quarterbacks, including Anthony Jennings, Brandon Harris and Justin McMillan.
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