Authorities investigating the death of music legend Prince found prescription opioid medication on his person and in his Minnesota home, a law enforcement official told CNN on Wednesday.<br />The pills are commonly used to treat pain, and investigators have brought in the U.S. Drug Enforcement Administration to help with the case, the source said.<br />Investigators believe a health scare about a week before Prince's death, which caused an unscheduled landing of his plane in Illinois, was likely the result of a reaction to the pain medication, the official said.