Della was seen in the pre-title sequence for the most part. She is about to marry Felix Leiter, when Felix learns that the drug lord Franz Sanchez is in Florida, and with the help of Bond, pursues him. They return victorious, and the wedding commences. She kisses Bond before cutting the cake, but later unintentionally references Bond's earlier short-lived marriage to Tracy Bond, unsettling him a tad. Little does she know that this will be her last encounter with Bond, or with her new husband.
Later, they enter their room to find two Sanchez' henchmen (Perez and Braun) pointing guns at them. Dario, their leader, separates the two by force, and a fight breaks out. Felix is dragged away and taken to a marine research laboratory, where Sanchez lowers him into a shark tank, but Dario and the other men remain at the house and kill Della. Dario tells Felix before killing her that "We gave her a nice honeymoooooon!"
A visibly shaken Bond later finds Della, dead, on her bed, and soon swears to wreak havoc on the men responsible for her death and Felix's maiming, informing M at one point that Della's death is one of the primary catalysts for his desire for revenge as Della was unaware of the risks of Felix's life even if Felix was aware of the possibility that an enemy might attack him.
Behind the scenes
The script – initially called Licence Revoked – was written with actor Timothy Dalton's characterisation of James Bond in mind, and the obsession with which Bond pursues Sanchez on behalf of Leiter and his dead wife is seen as being because "of his own brutally cut-short marriage" to Tracy in On Her Majesty's Secret Service. Bond's marriage was even mentioned in the film.