"It essentially kills you in this explosion of cell death," she said. "You feel like you're suffocating."
After the initial cause of death was released, a relative of Khan's asked authorities to look into the case further, Cina said. He would not identify the relative. The full results came back in November.
"She (the morgue worker) then reopened the case and did more expansive toxicology, including all the major drugs of use, all the common prescription drugs and also included I believe strychnine and cyanide in there just in case something came up," Cina said. "And in fact cyanide came up in this case."
Chicago Police Department spokeswoman Melissa Stratton confirmed the department was now investigating the death, and said detectives are working closely with the Medical Examiner's Office.
Investigators will likely exhume the body, Cina said.
Oshana said he was shocked to hear that someone might have killed Khan.
"I'm very sorry for him," Oshana said.