A “soccer mom” from Pennsylvania who was thrust into the national gun-rights debate after taking a loaded pistol to youth sports events was killed by her husband in a shooting witnessed online by her video chat partner. Scott Hain used his own gun to fire several shots into his wife, Meleanie, 30, while her video chat was active and perhaps as she washed dishes in their kitchen, police said. Mr Hain, 33, later killed himself in an upstairs bedroom. Mrs Hain’s loaded pistol — with a bullet ready in the chamber — was in a backpack hanging from the front...