An official cause of death will be determined by the medical examiner for San Joaquin County.
According to TMZ, he died from complications relating to contracting COVID-19. He was diagnosed with the virus a month ago and had received treatment in hospital before being returned to the prison after recovering well.
After he had "trouble breathing", Spector was later rushed to hospital again where he died.
She concluded her post by sharing: "I still smile whenever I hear the music we made together, and always will". They had a 1958 hit with a song that took its wording from his father's gravestone - "To know him is to love him".
After a deal with IMPERIAL RECORDS failed to result in further hits, the group broke up and SPECTOR turned to writing and producing.
In 1961, he and promoter Lester Sill formed Philles Records, releasing singles with what was becoming his trademark sound.
He also came out with a technique known as "Wall of Sound" during the '60s.
The American record producer was famous in the music world for developing the Wall of Sound formula in the 1960s, that was tailored towards making studio recordings sound full and orchestral on the radio and jukeboxes of that era. He produced a flurry of hits. from The Righteous Brothers "You Lost that Lovin' Feeling", "Unchained Melody", "You're My Soul and Inspiration", The Ronettes' "Be My Baby", The Crystals' "He's a Rebel", and on and on.
The star of "Barbarian Queen" and other B-movies, was found shot to death in the foyer of Spector's property. All I see stamped to his name is a woman killer who was sentenced to 19 years to life in a California state prison. He was given a sentence of 19 years to life.
In 2009, he was convicted of the 2003 murder of Hollywood actress Lana Clarkson.
In an act of humble graciousness, Ronnie Spector, a superlative singer who suffered at the hands of Phil Spector during a torrid and abusive seven-year marriage, has issued a statement on Instagram celebrating the man: "It's a sad day for music and a sad day for me".