Crimestoppers have offered a reward of up to £20,000 for information that leads to the arrest and conviction of whoever murdered expectant mother Natalie McNally in County Armagh.A 32-year-old man has already been arrested on suspicion of the murder, and was taken to Musgrave Serious Crime Suite for questioning this morning.Detective Chief Inspector John Caldwell said police are releasing CCTV footage showing a man carrying a rucksack arriving at Silverwood Green on Sunday night.Mr Caldwell said: Detective Chief Inspector John Caldwell said: “Today, we are releasing CCTV footage, which shows a man, carrying a rucksack, arriving at Silverwood Green on Sunday night at 8.52pm. Then, at 9.30pm, we see him walking out of Silverwood Green. He appears to be wearing white footwear, possibly trainers."He urged anyone with information about the murder to come forward to police.PA