Warning: Discussion of murder and child abuse. The 21-year-old "Romantic Homicide" singer D4vd has been charged with, among other things, the murder of 14-year-old Celeste Rivas Hernandez. Earlier today, LA County District Attorney Nathan Hochman and LAPD Chief Jim McDonnell gave a press conference about the "brutal and horrific murder." In it, McDonnell said that he has spoken with Celeste's family, and stated, "Their grief is incalculable as to what happened to their daughter. What they have demanded, what we have assured them...[is to] bring their killer to justice. That killer, who we have now charged, is [D4vd's real name] David Anthony Burke." Here are the main takeaways from the charges and the press conference: What allegedly happened? McDonnell described Celeste as a "reported runaway from Riverside County." He continued, "During the course of our investigation, detectives learned that she had been involved in a sexual relationship with Mr.…