According to TMZ, Alfred was found unresponsive at his Kansas City residence. He is believed to have died of natural causes. TMZ adds that authorities do not expect any foul play was involved. Besides his relation to the "Kiss" singer, Jackson was also an heir to Prince's estate . The legendary performer himself died at 57 years old in April 2016. His death was related to an unintentional overdose of the synthetic drug fentanyl. I miss my brother, because my brother was everything in the world to me. God bless Prince, God bless the world. He’s a legend, he really is, Alfred Jackson, via 'Entertainment Tonight'