The teen who fled the country after allegedly gunning down a 15-year-old boy when a bitter gang-fueled brawl erupted at a Queens park has been arrested. Zahir Davis, 18, was nabbed Friday night – nearly two weeks after Pierre was brutally murdered surrounded by a crowd of teens in Roy Wilkins Park – according to the NYPD. Police said the alleged killer fled the country for Jamaica the day after the heinous caught-on-camera crime and was arrested as soon as he landed back in New York City at about 9:20 p.m.  18-year-old Zahir Davis has been arrested after the brutal murder of 15-year-old Jaden Pierre in Roy Wilkins Park. NYPD 15-year-old Pierre died after a bitter gang-fueled brawl erupted in the Queens park. Facebook / Rev-chaplain Peter Jones Police Commissioner Jessica Tisch announced Davis’ arrest Saturday morning. He’s been charged with murder.  Pierre was part of a group of teens who gathered in the park at around 6:20 p.m.…