Detectives arrested the 21-year-old, whose legal name is David Burke, on Thursday on suspicion of murder in the investigation of the killing of Celeste Rivas Hernandez, Los Angeles police said. Authorities had not publicly named Burke as a suspect previously. Investigators are expected to present a case to prosecutors on Monday, police said. Burke’s lawyers have declared his innocence. Here are a few things to know about the case: Singer was arrested, but is not currently charged Burke was arrested at about 4:30 p.m. Thursday, police said, at a home near the Chateau Marmont, the legendary Hollywood hotel that has been home to decades of industry scandal and lore. It is about two miles from the upscale Hollywood Hills street where Burke’s Tesla and Rivas Hernandez’s body were found. He was booked into a jail in South Los Angeles with no bail several hours later. Prosecutors say on Monday when they receive the case they will review it to decide whether there is enough evidence for charges. Burke’s defense attorneys stressed that Burke has only …