article_snippet.sent: An 81-year-old man has been arrested for allegedly stabbing to death An 81-year-old man granddaughter's ex-boyfriend after the young couple started arguing following the young couple 's first birthday party.
article_snippet.sent: Amber Diaz allegedly stabbed Mr Rivera, an unemployed musician, with a knife, before fleeing the scene.
article_snippet.sent: Nicolas Diaz (Ieft), 81, allegedly stabbed to death his granddaughter's ex-boyfriend, Kevin Rivera, (right), after the couple started arguing following the couple daughter's first birthday party on Sunday .
article_snippet.sent: Police: Diaz allegedly stabbed 21-year-old Mr Rivera with a knife, before fleeing the scene.
article_snippet.sent: the couple were arguing when Diaz reportedly lashed out at 21-year-old Mr Rivera with a knife. '
highlights_snippet.sent: Miss Diaz's grandfather, Nicolas Diaz, 81, allegedly intervened with knife .
  
highlights_snippet.sent: Victim 'stabbed Kevin Rivera in the chest'; fled the scene after Sunday's killing .
  