I think "they" should also be advised that:
Failure to Report a Crime under Federal Law (18 U.S.C. section 4)
Federal law prohibits concealing information about specific crimes. Under 18 United States Code, Section 4, you may be obligated to report a crime if you are directly asked during a criminal investigation whenever:
- You have knowledge of the commission of a felony;
- The felony actually occurred; and
- The felony is a federal offense;
If you willfully conceal the commission of a felony federal offense, you can be charged with “misprision of a felony.” Misprision of a felony is a form of obstruction of justice. If you are convicted, you face up to a $250,000 fine, imprisonment up to three years, or both fine and imprisonment...
It's also a felony in most states to knowingly aid someone you know to be guilty, after the fact of the crime, to evade capture.
I tend to have less sympathy for whomever is not speaking up about these murders. Two children were brutally killed. There's no need to think on this for 3 years. If someone knows, they should tell.
I suppose it's possible someone has told, anonymously, who the killer is. That will not be enough to convict that killer unless the teller now grows some courage with that conscience. AJMO