Singer and songwriter D4vd has been charged with murder, sexual abuse and dismemberment in the killing of 14-year-old Celeste Rivas Hernandez. His lawyers said he is not guilty and did not cause the death of the girl whose body, authorities said, was found in his towed Tesla SUV in Hollywood in September. The music of D4vd, pronounced “David,” became an online phenomenon when he was a teenager, before he found more traditional success. At a Los Angeles public hearing set to start Friday, which will look much like a trial, prosecutors will present evidence against the 21-year-old whose legal name is David Anthony Burke. It's expected to last about five days before a judge will decide whether he should go to trial on charges of first-degree murder, lewd and lascivious acts with a person under 14, and mutilating a dead body. Here are a few things to know about the case: What is the evidence against D4vd?…