First and foremost: the Bible NEVER teaches that a dream of death is automatically an omen in itself. Popular superstition is not the Word. Romans 8:15 reminds you that you have not received a spirit of slavery to fall back into fear.
Three Possible Interpretations
When It's a Loved One's Death
Instead of falling into anguish, pray FOR that person. Cover them with the blood of Jesus, ask for their protection, salvation, and deliverance. Often these dreams are a call to intercede, not a prediction.
When It's Your Own Death
It's almost always symbolic: God is showing you that a part of you (a character trait, an attachment, an inner idol) must die for another season to be born. Ask Him: 'What in me needs to die?'