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.LeMahieu joins an organization that already has former LSU infielders Ryan Theriot and Mike Fontenot on its major league roster.This year marked the second time LeMahieu was drafted. The Detroit Tigers chose LeMahieu in the 41st round in 2007 following LeMahieu’s senior season of high school.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 forego their senior season to begin their professional careers.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.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.The deadline for players to sign professional contracts is August 15.—-Contact The Daily Reveille sports staff at [email protected]