Possible Clues:

• So as to cause death
• What Brummel called the Prince, with dire results
• The one on your side, so overweight as to be the death of him
• Could your friend have got overweight to a lethal extent?
• What a deadly, overweight supporter
• Mortally
• It'd be the death of you to have such a large support
• How flies are attracted to a Venus's flytrap
• On the same side as yourself, but so overweight it'll be the death of him
• The way it might be the death of your overweight friend