The Tulsa Race Massacre of 1921 is regarded as one of the worst episodes of racial violence in US history.
A century ago, a white mob burned down part of the Oklahoma city known as "Black Wall Street", killing hundreds.
The blaze started with a spark caused by a portable lithium-ion battery cable.
Some 300 black people were killed in the 1921 massacre - but nobody has been held responsible.
Viola Fletcher and Hughes Van Ellis visited Ghana in 2021 to mark 100 years since the Tulsa massacre.
The quilt, made with 2,700 pieces of fabric, was made for the Queen by a Fareham woman in America.
Police say the man blamed the doctor for his back pain and had purchased a rifle only hours earlier.
Police say the suspected gunman has also died following the attack in Tulsa.
Joe Biden has become the first sitting US president to commemorate the 1921 Tulsa Race Massacre.
