Killers Amongst Us: David Temple beloved coach, murderer? (part 5)

Belinda Lucas Temple, eight months pregnant, is murdered in her Katy, Texas, home. Investigators begin to look for a suspect, but they don't have to look very far. Police argue her husband wants to get rid of her so he can marry his mistress, a teacher in the high school where he teaches. But apparently at the time of the murder, David Temple is caught on video with his son somewhere else. Where to from here?