BAY SHORE, Long Island (WABC) -- Two families are grieving Saturday night as Suffolk County homicide detectives remain on the hunt for a killer who murdered a man and woman in cold blood as they were simply walking through a Bay Shore neighborhood.A peaceful summer night was suddenly disrupted by gunfire Friday night when neighbors say they heard at least four gunshots ring out near Center Avenue and Oak Street."They sounded like firecrackers, but definitely I knew they were gunshots," said Lizeth Garcia.The tucked-away block behind the Bay Shore Long Island Rail Road stop was quickly flooded with police, who discovered 29-year-old David Arzu and 28-year-old Janelle Curella shot.The pair of friends were both taken to Southside Hospital where they were later pronounced dead.Overwhelmed with grief, the Arzu family declined to talk on camera, but described David as a loving father who leaves behind a 5-year-old son.The investigation is continuing.Anyone with information on the case is asked to call (631) 852-6392 or 1-800-200-TIPS.