Possible Clues:

• Feel sorry for redhead bird
• Mourn Romeo with bird
• It's with sorrow that one has to cut off the head for the bird
• Word in a famous Hale quote
• Feeling of repentance
• Ruth or Rachel's first bird
• 'That I have but one life to lose for my country,' to Hale
• Rue - remorse
• Feel sorry when soldiers get to guard Roundhead
• Sorry to have had the bird after beheading