Richard The Third - Child Murderer?

Richard of York.

https://www.independent.co.uk/news/uk/home-news/the-princes-in-the-tower-will-the-ultimate-cold-case-finally-be-solved-after-more-than-500-years-10466190.html

IMHO, the latin question Quis bono? - is critical. To me, Richard had most to gain.

Even so, I have read that 'rations' for the two princes were being drawn until after Richard's death. 

If this point has any significance, the finger of suspicion would then undoubtedly swing round towards Henry the 7th who would have needed to have his opposition removed.