Police seek motive in Purdue shooting that left teaching aide dead, 2nd student in custody

A path is lit for members of the Purdue All-American Marching Band during a vigil for a teaching assistant who was fatally shot on campus at Purdue University, on Tuesday, Jan. 21, 2014, in West Lafayette, Ind. The victim was identified as Andrew Boldt, 21, a senior in electrical engineering from Wisconsin who lived on campus, according to Purdue. Another student, Cody Cousins, was arrested on a preliminary charge of murder, athourities said. (AP Photo/The Journal & Courier, Michael Heinz) MANDATORY CREDIT; NO SALES (The Associated Press)

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Purdue University Provost Tim Sands speaks during a vigil for a teaching assistant who was fatally shot on campus, on Tuesday, Jan. 21, 2014, in West Lafayette, Ind. The victim was identified as Andrew Boldt, 21, a senior in electrical engineering from Wisconsin who lived on campus, according to Purdue. Another student, Cody Cousins, was arrested on a preliminary charge of murder, athourities said. (AP Photo/The Journal & Courier, Michael Heinz) MANDATORY CREDIT; NO SALES (The Associated Press)

EMS personnel speak with an Cody Cousins, 23, who was detained after a shooting inside the Electrical Engineering building on the campus of Purdue University in West Lafayette, Ind. Cousins, of Warsaw, Ind., is being held in the Tippecanoe County Jail on a preliminary charge of murder, accused of shooting 21-year-old Andrew Boldt of West Bend, Wis. (AP Photo/The Journal & Courier, John Terhune) MANDATORY CREDIT; NO SALES (The Associated Press)

WEST LAFAYETTE, Ind. – Police are looking for answers about why a senior at Purdue University shot and killed a teaching assistant in a classroom.

The shooting left the college campus about 60 miles northwest of Indianapolis in mourning.

Purdue senior Andrew Boldt of West Bend, Wis., died Tuesday. Police arrested fellow senior Cody Cousins on a preliminary charge of murder.

Purdue Police Chief John Cox says investigators believe Cousins targeted Boldt. No one else was injured, and Boldt surrendered shortly after the shooting.

Cox says there is no immediate indication that Cousins and Boldt had past troubles. Both were students in the engineering school.

The shooting prompted Purdue President Mitch Daniels to cut short a weeklong university trip to Colombia and order classes canceled through Wednesday.