Does it matter now, 36 years later, that Robert Wagner is a 'person of interest' in Natalie Wood's death?

I remember the headlines when it happened – Natalie Wood drowned, and the only people on the boat were Wagner, Christopher Walken, and the captain of the boat.

Now, 36 years later, Wagner is identified as a “person of interest”.

Does it matter? Even if they have reason to arrest him, what evidence can their be that hasn’t been looked at a hundred times before? Is this new development happening because there is actually something new, or is it all for some TV show?