Prince's death: The latest

Fans continue to mourn the loss of music legend Prince as state and federal officials piece together his final days.

Developments are emerging along two tracks: the cause of his death and what to do with his vast estate. Here's the latest:

The U.S. Attorney's Office and the Drug Enforcement Agency announced Wednesday they're joining forces with local investigators led by the Carver County Sheriff's Office.

They will provide "federal resources and expertise about prescription drug diversion," according to a statement issued by federal prosecutors in Minneapolis.

According to a law enforcement source, investigatorsfound prescription opioid medication on Prince and in his Minnesota home after his death.

So far, investigators haven't found valid prescriptions for the painkillers, law enforcement sources told CNN last week and again Thursday.

Federal investigators will try to determine if people in Prince's inner circle may have helped obtain drugs for him, law enforcement officials familiar with the investigation told CNN.

Opinion: Can Prince's death spark key discussion on opioids?

The DEA has an entire branch devoted to prescription drug abuse, which can involve complicit doctors or pharmacists, patients obtaining multiple prescriptions from a variety of physicians or the purchase of illegally obtained prescription drugs from illicit sources.

Officials have yet to publicly comment on what killed Prince. Results of an April 22 autopsy are still pending.

His issues with addiction

Also Wednesday, we learned that Prince's team sought help from Dr. Howard Kornfeld, an eminent opioid addiction specialist, the day before the entertainer died. Kornfield sent his son, Andrew, to Minnesota, to prep the singer for a possible trip to California for treatment.

By the time he arrived at the singer's Paisley Park complex on the morning of April 21, it was too late. Andrew Kornfeld ended up calling 911 to report Prince had been found unresponsive.

Since then, a former attorney for two of Prince's dead siblings has come forward with more troubling information. Lawyer Michael B. Padden said the siblings revealed Prince had an addiction to Percocet decades before his sudden death in April.

Duane Nelson, who died in 2013, was adamant that Prince was in no way just a recreational user, Padden said. The singer started using the drug to help him deal with the rigors of performing, Nelson said. Another half-sibling, Lorna Nelson, confirmed Prince's drug use but was not involved in getting drugs for him, Padden said. She died in 2006.

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In 'Game of Thrones' twist, Jon Snow is...

Disclaimer: The following story includes spoilers from Sunday's episode of "Game of Thrones."

Jon Snow is dead, fans have been repeatedly told.

But following the apparent death of the character in last season's finale there was still doubt in the magical world of "Game of Thrones."

Even President Obama was suspicious enough to ask the show's director whether Snow, the Lord Commander of the Night's Watch, was really dead. He was "deader than dead," director David Nutter assured the president.

Related: 'Game of Thrones' trailer begins with the end of Jon Snow

Yet, after months of theories, debates and steadfast denials, the HBO fantasy drama revived the hero on Sunday night.

The episode ended with Snow opening his eyes and taking deep gasps before immediately cutting to the credits.

In the moments following Snow returning to the world of Westeros, fans came alive themselves, flooding social media with shock, excitement, and a bit of anger.

Snow ended last season being stabbed to death by his own men, a fact that fans refused to accept.

This lead to months of creators D.B. Weiss and David Benioff shooting down theories and speculation that Snow, who is played by Kit Harington, would return.

HBO used the the question of Snow's possible life after death in much of its marketing heading into last week's premiere.

"Home," the second episode of the hit show on HBO, which like CNN is owned by Time Warner(TWX), ended the question once and for all.

The final moments were filled with tense silence as fans awaited to see if the character would again open his eyes following a spell cast on him by mystical Melisandre.

Once he did, fans were overjoyed if not a bit unsurprised.

"You'll never guess what happened," tweeted Dave Itzkoff, culture writer for The New York Times.

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