On August 4th, 1997, college student Fiona Yu was murdered and sexually assaulted in her Tempe, Arizona apartment. Despite DNA evidence at the scene, her case remains unsolved. Who killed Fiona Yu?

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Sources:
https://www.newspapers.com/image/124177972/?match=1&terms=Fiona%20Yu 
https://www.newspapers.com/image/124178134/?match=1&terms=Fiona%20Yu 
https://www.newspapers.com/image/124038423/ 
https://www.newspapers.com/image/580542301/?match=1&terms=Fiona%20Yu 
https://www.newspapers.com/image/124160409/?match=1&terms=Fiona%20Yu 
https://www.newspapers.com/image/124150201/ 
https://www.newspapers.com/image/124168075/?match=1&terms=Fiona%20Yu 
https://www.newspapers.com/image/124168728/?match=1&terms=Fiona%20Yu 
https://www.newspapers.com/image/124295614/?terms=Fiona%20Yu
https://www.newspapers.com/image/124405302/?terms=Fiona%20Yu 
https://www.newspapers.com/image/124160412/?match=1&terms=Fiona%20Yu 
https://www.newspapers.com/image/124402716/ 
https://www.newspapers.com/image/516366181/ 
https://www.newspapers.com/image/124012652/ 
https://www.newspapers.com/image/124426137/?match=1&terms=Fiona%20Yu 
https://www.newspapers.com/image/125496321/?match=1&terms=Fiona%20Yu 
https://www.newspapers.com/image/125826375/?match=1&terms=Fiona%20Yu
https://www.statepress.com/article/2012/11/police-continue-15-year-search-for-killer-in-unsolved-rape-murder
https://www.12news.com/article/news/local/valley/new-dna-technology-could-help-police-solve-20-year-old-tempe-murder/75-461726406 
https://www.abc15.com/news/region-southeast-valley/tempe/new-technology-could-help-solve-decades-old-tempe-murder-case 
https://www.newspapers.com/image/327705472/?terms=Fiona%20Yu 
https://www.youtube.com/watch?v=ruftQoRzFXk