Hi, I took a look around and the person that told you that it was an assassin bug was probably right. There are at least 47 different types of assassin bugs but this one seems like it's a Milkweed Assassin Bug or a Zelus Longipes. If they are out of doors, they seem to be quite beneficial getting rid of pests, and although they do not seek humans as mosquitoes would, they can and will bite. Apparently it hurts, so if in your house, you may want to get rid of it. Seems handling with a tissue, you would be able to put outdoors, but if already there, just let it be.