No. Killing his wife makes him guilty. This is just circumstantial evidence, which when taken along with the fact that HIS WIFE IS DEAD, makes him very high on the suspect list.
How to solve a Murder 101
Step one - Is the victim married?
Step two - If Yes, does the spouse have a credible alibi?
Step Three - If, no, start there.
I heard someplace that something like 60-75% of the murders of spouses are committed by the spouse. The police start there because the odds strongly favor the spouse being the culprit.
In the OJ case, they started with him because he had no alibi, not because he was a black man (sort of) who was married to a beautiful white woman.