SPOILER ALERT: This post contains details of tonight's Season 9 penultimate episode of AMC’s The Walking Dead. "We’ve known for years that this moment would come eventually, and it didn’t feel right to wait past this season," says The Walking Dead executive producer Angela Kang of the killing of 10 characters on the AMC series in tonight's Season 9 penultimate episode. TWD has long let the blood and mayhem flow in the second to last episode of most season, but the…