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Cellphone data, surveillance cameras helped detectives zero in on Yale grad student Kevin Jiang’s killer; Qinxuan Pan was friends with Jiang’s fiancée at MIT

New court records reveal for the first time how the high-tech manhunt for the man who shot and killed Yale grad student Kevin Jiang in February zeroed in on MIT researcher Qinxuan Pan as he attempted to elude authorities for three months.

Cellphone location data, surveillance cameras, license plate readers and traditional shoe-leather detective work all contributed to authorities’ quick unraveling of what happened just after Jiang’s death and where their prime suspect may have been on the lam, according to a nearly 100 page dossier of arrest and search warrant records unsealed and released Friday.

Pan, 30, has been charged with murder and remains in custody on $20 million bond, a figure so high it is believed to be a record in Connecticut and that has been appealed by Pan’s defense attorney William Gerace.