Is out-of-game chat reportable?

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You can message it to Support under general issues

By why add someone after the game if they were toxic?

Sometimes you can calm people down by just talking or listening to them. This is one of the few times I've had such a hostile response; usually they have at least some curiosity and you can use it start talking to them and trying to get them to realize how much their words can hurt others.

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No, if you allow someone to talk in private to you, it's at your own risk.

that's fine, I just wasn't sure what riot's stance on it was.

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I assume after the game he gave you a friend invite? you accepted and he ambushed you with the threat?

That what they all do "Hope you have cancer" was one i got along time ago.

To answer, technically you can't report him on the client, you would have to send a support ticket and include the unedited screen shot.

it's harassment and unacceptable behavior based on the summoners code.

no I sent him an invite, but he removed me right after saying that.

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That's literally a federal crime actually, so you could report it to the FBI if you want to. I'm not saying you should, but you could. A big company like Riot is no doubt aware of just how much a serious legal matter sending death threats online actually is so they'll probably act upon it.

How? I get death threat daily just because I wear my mask.