It incites Romeo into killing Tybalt. The death of Tybalt not only get Romeo banished but makes it very unlikely that Lady Capulet will ever accept his marriage to Juliet. She would certainly have Romeo killed if she knew (she is planning to kill him anyway).
He brings Romeo the news of Juliet's death.
Balthasar brings Romeo the news of Juliet's "death"
Yes, the death of Romeo and Juliet did end all fighting in Verona.
Balthasar told romeo about juliet's death.
When Romeo learns of Juliet's death, he decides to purchase a deadly poison so he can join Juliet in death. He plans to go to Juliet's tomb, take the poison, and die next to her.
Romeo's friend Balthasar tells him
Balthasar
romeo died from drinking poison and Juliet died from stabbing herself in chest
He could've been at Juliet's casket waiting for Romeo
Romeo's servant brings him news of Juliet's death in Mantua. The servant is unaware that Juliet's death is a ruse to avoid marrying Paris, leading Romeo to return to Verona and ultimately take his own life.
I think it is Mercutio. He was really good friends with the family but was not directly related to them. After his death, Romeo killed Tybalt, who was the cousin of Juliet.
Romeo takes his own life, here is the story Romeo hears of Juliet's death, Romeo enters the tomb, finds Juliet's 'corpse' and poisons himself. Juliet wakes from her drug induced 'death' to find Romeo dead. Unable to live without him, she stabs herself.