The Associated Press has learned, through an anonymous law-enforcement source, that tests show Prince died of an opioid overdose. The 57-year-old singer was found dead April 21 at his Minneapolis-area estate. The findings confirm suspicions that opioids played a role in the musician's death. After he died, a law enforcement official told the AP that investigators were examining whether an overdose was to blame and whether a doctor had prescribed him drugs in the preceding weeks.