Short answers, pulled from the story.
The cause of Cleopatra's death remains disputed. Ancient sources including Strabo, Plutarch, and Cassius Dio describe either an asp bite or the use of poison introduced through a sharp implement such as a hairpin. Modern scholars question the snakebite account on practical grounds, noting the difficulty of smuggling a large Egyptian cobra and the slow nature of its venom.
Cleopatra died on either the 10th or the 12th of August, 30 BC, in Alexandria, when she was thirty-nine years old. Scholar Theodore Cressy Skeat argued for the 12th of August based on cross-examination of historical sources; other scholars including Duane W. Roller and Joann Fletcher support the 10th of August.
After a spy informed Cleopatra that Octavian intended to parade her as a prisoner in his Roman triumph, she chose death over that public humiliation. She had already told Octavian directly, "I will not be led in a triumph." Committing suicide allowed her to avoid capture and public disgrace.
A minority of scholars argue Octavian ordered her poisoning, including Gregory Tsoucalas and Markos Sgantzos. Criminal profiler Pat Brown argues in Murder of Cleopatra that the death was covered up by Roman authorities. The majority of primary sources, however, report her death as suicide.
The location of Cleopatra's tomb is unknown. The Egyptian Antiquities Service believes it may be at or near the temple of Taposiris Magna, southwest of Alexandria. Archaeologists Kathleen Martinez and Zahi Hawass have excavated the site and found forty coins minted by Cleopatra and Antony, an alabaster bust of Cleopatra, and an alabaster mask resembling Mark Antony.
Caesarion, her son with Julius Caesar, was executed on Octavian's orders on the 29th of August, 30 BC, just eighteen days after her death. Her three children with Mark Antony, Alexander Helios, Cleopatra Selene II, and Ptolemy Philadelphus, were spared and brought to Rome. Cleopatra Selene II eventually married Juba II of Mauretania.