LSU infielder DJ LeMahieu signed with the Chicago Cubs and will forego his final two seasons with the Tigers, LSU team spokesman Bill Franquez said in a news release Monday.LeMahieu, who switched from shortstop to second base for the Tigers last season, has joined the Cubs’ Rookie League team in Mesa, Ariz.The Cubs’ second-round pick becomes the fifth member of the 2009 College World Series champion to join a professional roster.Outfielder Jared Mitchell and first baseman and catcher Sean Ochinko will both forego their senior season to begin their professional careers, while pitchers Louis Coleman and Nolan Cain will start their careers after finishing their eligibility at LSU.Designated hitter Blake Dean will return for his senior season, and left fielder and infielder Ryan Schimpf has yet to announce a decision whether to come back for his senior campaign or sign with the Toronto Blue Jays organization.—-Contact The Daily Reveille sports staff at [email protected]