With respect to Kelly Monaco, I watch GH as much as I can and did see her death scene. All the actors involved went above and beyond, especially Sam's mother, Alexis, portrayed by Nancy Lee Grahn.
Interestingly enough, Lindsay Hartley (former Arianna Hernandez on Days) stood in for Kelly Monaco as Sam on and off.
Rather than recast Sam, they chose to kill her off, which will have a domino effect on the show. She will be sorely missed.
Sidebar: As I am sure many know, one of Sam's sisters is played by Kate Mansi, formerly Abigal on Days. She is doing a magnificent job on GH.