Help me please

[howdydoody]

For the life of me I can't remember the name or anything.

All I do remember was a bunch of people being at a barbecue/pool and someone recognising one of the people and he pulls a gun out and kills them all, wife and kids. But doesn't quite kill the woman who recognises him.

Not much to go on, but I've been frying my brain with this now.

Thanks for any help

[Victoriouz]

Hunters S01E01?

[bowfinger]

yep, it's a delicious opening.