‘HÄAGEN-DAZS KILLER STRIKES AGAIN!’ screamed the headline, as did executive Peter Jenkins. It was a PR disaster. That was three. Each bloodied corpse left with a half-eaten tub of Häagen-Dazs next to it. The latest theory: the killer was following people who bought Häagen-Dazs, killing them, then eating the ice-cream. ‘What flavour this time?’ his…