Your bug, rather than a milkweed or other plant feeder, I believe this to be one of the assassin bugs.
They are somewhat of a mimic. Longer, more raptorial front legs hold prey, longer beak.
Confine it with a small insect to find out. They bite man, and it is painful.
Yep, I had my doubts about the ID.
It does look like one of the assassins.