Purdue University

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In this photo provided by Songlin Fei, Purdue University, taken May 16, 2017, an Eastern white pine tree. Eastern white pine trees in the U.S. have moved more than 80 miles west since the early 1980s, according to a new study. by Songlin Fei of Purdue University. A warmer, wetter climate is helping push dozens of Eastern U.S. trees to the north and, surprisingly, west, a new study finds. (Songlin Fei/Purdue Univesity via AP)

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Interim head coach Gerad Parker fields questions from the media following the announcement that Darrell Hazell had been fired as head football coach Sunday, Oct. 16, 2016, at Purdue University in West Lafayette, Ind. (John Terhune/Journal & Courier via AP)

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Cody Cousins, right, walks down the hall, Thursday, Jan. 23, 2014, inside the Tippecanoe County Jail in Lafayette, Ind., on the way to his initial hearing on charges of murder in Tuesday's shooting and stabbing death of engineering student Andrew Boldt on the campus of Purdue University. (AP Photo/Journal & Courier, John Terhune, Pool)

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Cody Cousins, right, walks down the hall, Thursday, Jan. 23, 2014, inside the Tippecanoe County Jail in Lafayette, Ind., on the way to his initial hearing on charges of murder in Tuesday's shooting and stabbing death of engineering student Andrew Boldt on the campus of Purdue University. (AP Photo/Journal & Courier, John Terhune)

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This undated booking photo provided by the Tippecanoe County Jail shows Cody Cousins, who faces preliminary charges of murder for the shooting death of Andrew Boldt, a 21-year-old Purdue University student from West Bend, Wis., inside the school's Electrical Engineering Building, on Tuesday, Jan. 21, 2014. (AP Photo/Tippecanoe County Jail)