Ray Manzarek and Robby Krieger light candles in Paris
The former two bandmates paid tribute at their former frontman's grave in Paris by lighting candles.
They were joined at the Pere Lachaise cemetery by a group of Morrison's fans, who laid flowers while wearing t-shirts bearing the words "40th anniversary".
The grave has long been a pilgrimage site for his fans.
Morrison died in 1971 in the French capital, with the cause of death believed to have been a drug overdose.