Cayde-6 is one of the NPCs located in The Tower Plaze. He is a Hunter Vanguard.
Cayde-6 unfortunately died in the beginning of the Destiny 2 expansion Forsaken at the hands of his own gun, The Ace of Spades. The trigger was pulled by Uldren Sov.
When Cayde died, the pursuing Guardian held Cayde in his arms. His final words to Uldren was a snide remark about Uldren's sister Mara Sov.
Cayde hid ten stashes of loot around areas with audio recordings of people who he believed either killed him or knew on a personal level.
The first one was directed to Eris Morn, who he apologized to for stealing her ship. He then said that if Eris did kill him, he considered his actions justified.