What kind of spider is brown with heart shaped body and fangs?

The spider you're describing is likely the brown recluse spider. It has a distinctive violin-shaped marking on its back, which can sometimes appear heart-shaped, and it is typically light brown in color. The brown recluse is known for its potentially harmful bite, as it can lead to necrotic lesions in some cases. However, it is generally reclusive and avoids human contact.