From Inside Edition.

Bryan Kohberger, accused of murdering four University of Idaho students, bought a black mask that prosecutors say is identical to the one used by the killer. Prosecutors say Kohberger purchased the mask, known as a "balaclava," from a Dick’s Sporting Goods in Pittsburgh months before the murders. Prosecutors also want to introduce into evidence a paper Kohberger wrote for his criminology course at DeSales University, which they say shows an "obsession with murder." Kohberger has pled not guilty.