Not stage a suicide, leave the door unlocked and not make up a phonecall.
I have also said that many times now.
I have never heard about another case of a two shot murder staged as suicide.
That puts him in a worse situation -
Not stage a suicide - He cannot insinuate Sheila.
Not make up a phone call - He has no alibi and is first on the scene.
Leave the door open - No one will believe a random psycho/burglar.