Officials await the results of toxicology reports to confirm the overdose.
Stephen Liu is an emergency room doctor at California Hospital Medical Center where Roth died.
"I've seen a number of them here over a couple of years and it's always a bad outcome," Liu said. "This is not a gathering of people to go to a concert. We have concerts at Staples Center and L.A. Live and you don't get these types of patients that come in."
Like other medical professionals in the area, Liu is calling for an end to the huge raves that attract tens of thousands to Downtown L.A.
"Some of these patients are just found on the ground and who knows how long they've been down there before someone calls the paramedics over because there are just so many people there," Liu said.
Coliseum officials are looking to hold a special meeting to make sure that the promoters followed proper procedures in the weekend event.
Roth was 15, but the minimum age to attend the rave was 16.
There is another patient at California hospital brought in from the same rave. He's in critical condition.