"Krokodil" may have claimed its first victim in the US. Authorities are currently investigating whether the new street drug "krokodil," which is similar to heroin but ROTS FLESH FROM THE INSIDE OUT, killed Justin McGee of Duncan, Oklahoma.

The drug Krokodil has gone viral on the Internet because, um, it eats flesh.

Krokodil has been making its way to the US from Russia, where it is a cheap alternative to heroin. Over time, skin dissolves from the effects of Krokodil, leaving green, scaly scarring-much like a crocodile. The life expectancy of users is about two years.

The Oklahoma Bureau of Narcotics is investigating whether krokodil was involved in the death of McGee, who is a father of four, and a friend of McGee's.

The first use of the drug was reported in September 2013, in Arizona. Joliet, Illinois has now been the site of several krokodil-related hospitalizations.

In Joliet, Ill., Dr. Abhin Singla, an addiction specialist at Presence St. Joseph Medical Center, said he had seen several cases.

"As of late as last week, the first cases - a few people in Utah and Arizona - were reported to have been using the heroin-like drug, which rots the skin from the inside out," said Singla.

He added: "It is a horrific way to get sick. The smell of rotten flesh permeates the room. Intensive treatment and skin grafts are required, but they often are not enough to save limbs or lives."

Sisters Amber Neitzel and Angie Neitzel of Joliet, Ill. are users of the drug, and spoke about their experience in an NBC interview.

"I'm scared to death right now. I can barely leave my house," Angie Neitzel said. "I have to go to an infectious disease doctor, decide how much it's progressed and wind up doing skin grafts," she added.