Prince, Peace Concert

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More eyes are focusing on Prince's death investigation.

E! News has learned that the U.S. Attorney's office and Drug Enforcement Administration are joining the iconic singer's investigation.

"The U.S. Attorney's Office and DEA are joining the Carver County Sheriff's investigation," a spokesperson for the U.S. Attorney's office tells E! News.

"The DEA and U.S. Attorney's Office are able to augment this local investigation with federal resources and expertise about prescription drug diversion. While this remains an ongoing investigation, we will have no further comment."

The Carver County Sheriff's Department tells E! News, "The US Attorney and DEA have agreed to provide resources and expertise in our investigation."

The new involvement in the investigation come shortly after learning that the musician died one day before meeting with a California doctor who specializes in addiction, according to a new report from the Minneapolis Star Tribune.

The "Purple Rain" singer was allegedly suffering from an addiction to pain killers and had representatives reach out to Dr. Howard Kornfeld, a national authority on opioid addiction treatment, because Prince was "dealing with a grave medical emergency," said William Mauzy, an attorney working with the Kornfeld family.

But Kornfeld couldn't clear his schedule, so he sent his son, Andrew Kornfeld, in his place. Andrew works with his father at Recovery Without Walls in Mill Valley, Calif. Andrew was supposed to discuss how the confidential treatment plan would work, but when he arrived at Paisley Park the legendary singer couldn't be found.

"The plan was to quickly evaluate his health and devise a treatment plan," Mauzy said to the Star Tribune, speaking on behalf of the Kornfelds. "...The doctor was planning on a lifesaving mission." 

Kornfeld ended up being one of the three people present at Paisley Park on the day Prince was found dead.

The medical examiner began his autopsy the following day. She said results, which would also include toxicology, would take "several weeks." Authorities ruled out foul play and suicide.

—Reporting by Holly Passalaqua

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