Why did Prince die? Autopsy performed on U.S. music legend

By Piya Sinha-Roy and Jill Serjeant (Reuters) - An autopsy on U.S. music superstar Prince on Friday sought to determine why the innovative performer died, but authorities cautioned it could take weeks before the results are made public. The local Carver County Sheriff's Office is investigating the circumstances of his death, and Sheriff Jim Olson was due to hold a news conference at 3 p.m. (4 p.m. ET, 2000 GMT). The influential star, born Prince Rogers Nelson, was found unresponsive in an elevat