I cannot find any way to simply cancel a n longer used but charged roku $4.99 monthly charge.
If the subscription is via Roku, it will be in https://my.roku.com/account/subscriptions (after logging in).
If you're simply being *billed* via Roku (which happens with several channels) then you'll want to cancel with the channel provider.
You didn't mention which channel it is you're looking to cancel, so it could be either of the above depending on your scenario.
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