What were the events that lead the deaths of Romeo and Juliet?

There were many factors which led up to Romeo and Juliet's death. The feud between their families was one. ("the continuance of their parents' rage which but their children's end, naught could remove") Their adolescent passion might be another ("It is too rash, too unadvised, too sudden, too like the lightning which doth cease to be before one can say "It lightens") Their parents, especially Juliet's father, are another ("Fettle your fine joints 'gainst Thursday next to go with Paris to St. Peter's church or I will drag thee on a hurdle thither.") The bad advice of Friar Lawrence is another ("if aught in this miscarried by my fault . . .") Fate, or just plain bad luck, had it's place ("a pair of star-crossed lovers . . . their death-marked love" "Oh, I am fortune's fool!" "But he which bore my letter, Friar John, was stayed by accident.")

None of these caused their deaths. Romeo caused his own death by knowingly drinking poison. Juliet caused her own death by sticking a dagger into herself.