(CNN)Police say a man accused of fatally stabbing a 17-year-old in the throat at an Arizona convenience store told them he felt threatened because the teen had been listening to rap music.Al-Amin's mother told CNN she didn't understand how anyone could think he was a threat. "My son is so special and so loved and everyone loved him," Serina Rides said. "He's so compassionate and caring, so caring about everyone." She said he was going to be a senior in high school and was turning 18 on July 28. He worked at Subway and Taco Bell and was hoping to get a third job. "My son didn't drink, smoke, do drugs, party. He loved music and working. He was focused on his goals," she said. She said he wanted to be just like Jay-Z, who Forbes says is the first billionaire rapper. "He started mowing lawns at 13 and saving money because he wanted to own his own business very young," she said. "He recruited other kids to work for him in the lawn business, and he was so good. I was so proud of him." Rides was getting ready for her son's funeral on Monday. "My son's not aggressive. My son's never been in any gang in any affiliation with anything," she said. "He's a good boy. He's a good baby. He's my baby, and I have to bury him. I'm on my way to bury him right now."
CNN's Samuel Romano and Daniel Sills contributed to this report.