PORT ST. LUCIE, Fla. The dog at the center of a neighborhood dispute that left three people dead on Monday has been euthanized, police said. Officials told Ronald Delserro the dog would have to be quarantined until March 14. But on March 5, Monique Hansman told animal control workers Roxy was unsupervised and running around, the report said. The Delserros were issued a dangerous dog citation. Sandra Delserro signed dangerous dog documents on July 1, the paper reported.