A teen has been arrested in the fatal July shooting of 15-year-old Phillip Mitchell, according to Chicago police.The 17-year-old was arrested Thursday and now faces a first-degree murder charge, police said. Previously, a 16-year-old had been taken into custody blocks from the scene on the day of the shooting and was questioned by police before being released.According to Mitchell's mom, Racquel Bussell, he had just left work and was walking into Sunny’s Sub restaurant with his cousin and a friend on their way to grab dinner and some snacks when he was fatally shot July 10. Related Phillip Mitchell, 15-year-old fatally shot in Greater Grand Crossing, always wanted to make ‘one more song’ Two people approached Phillip on the sidewalk and an argument erupted in the 7100 block of South King Drive about 5:40 p.m., according to a police report. The suspect allegedly pushed Phillip and a second person shot him at close range, hitting him at least once in the head.Officers responding to a ShotSpotter alert found Phillip in the middle of the street suffering from multiple gunshot wounds to his head and body. He was taken to Comer Children’s Hospital, where he was pronounced dead at 6:13 p.m., police and the Cook County medical examiner’s office said.The 17-year-old suspect is due in court Saturday.