My friend already identified it as belonging to the Heteroptera order, but I was wondering if anyone knows the name of the species.
Found in Toronto, Ontario, Canada, on July 21 2017, in a residential bathroom.
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This is, indeed, a Heteroptera bug.
Here is an image of the same bug, also in Ontario, from the Canada Pest Control website:
And in this photo you can see the long rostrum, just like in your second photo:
Finally, to see an assassin bug in action (a different species, though), have a look at this video from the Smithsonian Channel: https://youtu.be/hXFRAmWiaa4