Officials from the L.A. County Coroner's office said Wednesday that drugs are suspected in the death of Joseph Gordon-Levitt's older brother Dan Gordon-Levitt, RadarOnline.com has learned.
According to Coroner's spokesperson Ed Winter, Dan Gordon-Levitt, 36, was pronounced dead on October 4 at 3:58 a.m. in Hollywood.
The autopsy has been completed, Winter said, and results of the autopsy are being deferred pending toxicology results. Dan Gordon-Levitt was with two other friends at the time, Winter said, and one was taken to a nearby hospital.
As RadarOnline.com previously reported, on Tuesday night, Joseph Gordon-Levitt Tweeted: "My super hero brother @burningdan 1974-2010," the 500 Days Of Summer star Tweeted. Celebrate his life here ~ http://bit.ly/dBTMQ8 because he's f**king awesome."
Dan Gordon-Levitt -- also known as Burning Dan -- worked professionally as a performer, as well as a fire-spinning and flow arts teacher in Venice Beach, California. He had a Web site touting his wares at www.burningdan.net.
Joseph Gordon-Levitt recently starred opposite Leonardo Dicaprio, Ellen Page, and Marion Cotillard in the smash hit Inception. His other work includes the critically acclaimed 500 Days of Summer, Killshot, and the television show Third Rock From The Sun.
Joseph later wrote on his Website hitRECord.org, "BURNING dAN brightly embodied that bold beastly bliss sometimes referred to as 'the creative spirit. "He would absolutely positively insist that we not let this bad news deter us on our collective mission."
Dan Gordon-Levitt spoke to our friends at PopEater less than two months ago on the heels of his brother's performance in Inception.
He dished to the Web site about his passion for Flow arts ("a combination of performance art and dance and meditation and yoga and sort of self-transformation") and the uncanny resemblance he bared to his brother.
"It's wonderful to be mistaken for him," Dan told the Web site in the August 11 interview. "He taught me to question the relationships other people have with their siblings because he would be my favorite person in the world even if I wasn't lucky enough to know him as my brother."
Dan held little back when talking about his fondness for his brother, as there was clearly no sibling rivalry between the pair, just love and support.
"He's just awesome in every way that I pay attention to," Dan said of Joseph. "I ask myself, 'Do I love him because he's my brother or is he really that awesome?' He's really, really awesome ... it' rare that I don't feel really proud of him."