You're assuming he knows. What if he had no idea KK came to WP over Thanksgiving? PF handed over his cell phone, gave a DNA swab, and his first attorney had spoken to LE. Then PF has said nothing. Now I will admit the whole situation does not make PF look innocent of murder - but if the pillars of the murder charges are the word of IN alone who had KB's phone and sent the texts.... there is a problem.
What evidence specifically shows PF committed the murder?
They have enough that they charged him! There’s no way on earth they did so based on INs word alone. Warrants aren’t issued on finger pointing.