Monday marked the fourth day of the murder trial for the two men accused of killing Philadelphia Police Sgt. Richard Mendez during a confrontation at a Philadelphia International Airport parking garage last year.

Today's focus was on forensic evidence with a homicide detective taking the stand and telling the jury that pictures, Instagram posts and other social media interactions link Yobranny Martinez-Fernández, 20, and Hendrick Peña-Fernández, 23, to each other as well as three locations that night of the deadly shooting.

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The two men are accused of being part of a theft ring targeting vehicles in the airport parking garage when they were interrupted by Mendez and his partner, officer Raúl Ortíz.

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