The Vancouver resident was found unresponsive at the Paradiso music festival near Wenatchee, Wash. on June 27.
"It was clear he was very seriously ill and on June 30 he was transferred back to Vancouver General Hospital," the coroner said.
Coroners are still working to determine the exact cause of death but say extreme heat may have played a factor. Temperatures at the music festival were reported to be as high as 40 degrees.
Pandher was also a videographer, according to his Facebook page.