Ka taƙaita labarin:  Boston (CNN) Da misalin karfe 9:35 na daren ranar Alhamis a watan Afrilu na shekarar 2013 kuma shugaban 'yan sandan Massachusetts Institute of Technology John DiFava ya kusa yin watsi da shi. A hanyarsa ta fita, ya ga daya daga cikin jami'an sa na farko, Sean Collier, yana zaune a cikin motar sa. Ya tsaya ya ce gaisuwa. "Na yi magana da shi na 'yan mintoci kaɗan. Na gaya masa ya kasance cikin aminci kuma na tafi, "in ji shugaban a cikin kotun da ke cike da jama'a a ranar Laraba. Ya kiyasta cewa tattaunawar ta ɗauki minti uku, wataƙila huɗu. "Shin kun taba ganin Sean Collier da rai bayan haka?" Mataimakin Babban Lauyan Amurka William Weinreb ya tambaya. "Ban yi ba". Kasa da sa'a guda daga baya, Collier ya kwanta yana zub da jini a cikin motar sintirinsa bayan an yi masa kwanton bauna kuma an harbe shi a kai. Kofar motarsa a buɗe take, kuma ƙafafunsa sun makale tsakanin gas da kuma birki. DiFava da sauran jami'ai, da taimakon bidiyo na tsaro, masu kiran 911 da kuma wani mai keken keke wanda ya faru ya wuce, ya sake maimaita lokacin karshe na Collier a cikin hukuncin kisa na gwajin kisa na Boston Marathon bom Dzhokhar Tsarnaev. Mai keken, MIT lissafi Ph.D. dan takarar Nathan Harman, ya nuna Tsarnaev a kotu kuma ya bayyana shi a matsayin mutumin da ke da "babban hanci", wanda ya ga yana jingina a cikin motar 'yan sanda ta Collier. Ya ce Tsarnaev ya kasance shi kaɗai. Tsarnaev, wanda ke da shekaru 19 a lokacin, bai yi jayayya da cewa yana nan lokacin da aka kashe Collier da yammacin ranar 18 ga Afrilu ba, kuma bai musanta cewa ya shiga cikin hare-haren bam din kwana uku da suka gabata wanda ya kashe mutane uku kuma ya raunata wasu fiye da 240 ba. Masu gabatar da kara sun ce Tsarnaev da babban dan uwansa, Tamerlan Tsarnaev, sun kashe Collier ne saboda suna son bindigarsa. Amma an hana su ɗaukansa saboda wani abin da ke cikin kwalba. Hukumar FBI ta saki hotunan ma'auratan sa'o'i biyar da suka gabata, kuma suna kan gudu. Amma Tamerlan, mai shekara 26, ba zai tsira da daren ba. An kashe shi a cikin bindiga da bindiga tare da 'yan sanda wanda ya fara da rahotanni na "wani jami'in da aka kashe" a MIT. 'Yan sandan MIT, wadanda' yan sandan jihar Massachusetts suka sanya su a matsayin jami'ai na musamman, suna sintiri a harabar da ke Cambridge....
Shaidar ta mayar da hankali kan harbin mutuwar jami'in MIT, 26. An kashe Sean Collier kwana uku bayan harin Boston. Mai keken ya gano Tsarnaev, ya sanya shi a wurin da aka kashe Collier.