The correct answers are Who stole the famous painting?, Who did you see near the museum vault?, and Who reported the crime to the police?.

When the question word (like Who) is the subject of the sentence, we do not use auxiliary verbs like do/does/did. We just use the normal verb order (e.g., Who stole...?).

When the question word is the object, we must use an auxiliary verb and invert the subject and verb (e.g., Who did you see...?).