Owen Sound, Ontario, 2014-Sept-18, found in house near shoes. 3-4mm. Looks to have angular plates all over body and legs. Squarish head, thick antenna bases, In the first photo, the head is at 5 o’clock.
Your insect is the nymph or young stage of a true bug called masked hunter. This is in the assassin bug family so they are predators on other insects.
Nymphs exude a sticky substance that causes dust, lint, and other small particles to adhere to the surface of their body. This camouflage may help the nymph avoid detection by both predators and prey.
Caution: These nymphs can bite humans in self-defense when mishandled. The bite is said to be very painful.
Both the adult and nymph are predators. They prefer dry habitats and if found in the house there are never very many. They are said to feed on woodlice(think pillbugs or rolly pollys that do not roll), lacewings, earwigs,and bedbugs.
Hopefully you just brought it in from outside.