Methuselah

Methuselah was killed by Goliath II and was King David's oldest friend.

History
At the Springfield Swap Meet Bart, Milhouse and Nelson saw free trading cards and started to like the cards. Two of the cards were Joseph of Aramathea and Methuselah. Ned Flanders then asked who'd have thought learning about religion could be fun. The kids then understood what the cards were and started to run away.

Non-canon
After King David killed Goliath with a slingshot his son Goliath II enacted revenge and killed King David's oldest friend Methuselah. David decided then at he should kill Goliath II.