looks like something in the Reduviidae or Pentatomidae family, frequently called assasin or stink bugs. Not generally poisonous but can sometimes inflict a painful bite. Stink bugs come with a nasty taste to match their smell, so if your cham didnt like it I doubt he'd try again
Yes it does look similar to a box elder bug or stink bug, but doesn't stink at all, even when squished. They are also eating my fruit trees, even the citrus and persimmon trees. (I live in Utah, so those trees are very rare here and kept in pots.)