Chester Bennington in Wroclaw, Poland, June 5, 2014.

The Los Angeles County Coroner's office has concluded its investigation into the July 20 suicide of Linkin Park singer Chester Bennington, confirming its initial ruling: Death by hanging. 

The toxicology portion of the autopsy report, obtained by USA TODAY, revealed a “presumptive positive” for methamphetamine or MDMA (ecstasy) in his blood using ELISA, an antibody-based test. It did not specify which of the two it was or how much was present.

Meanwhile, a mass-spectrometer test, which is used to find specific drugs and quantify the exact amounts found, failed to detect either drug in the urine sample, where drugs remain for a longer period of time. 

According to the report, a prescription bottle of the sedative Ambien (Zolpidem), which the singer occasionally used, was found near his body, however, that drug was not detected in the toxicology screen.

A half-empty bottle of Corona beer was also found nearby, which could explain the small amount of alcohol present in his system. But at .05%, it wouldn't have been enough to register as a DUI in California.