"Death Bed Confession" joke

Jake was on his deathbed. His wife Susan, was maintaining a vigil by his side. She held his fragile hand,
tears ran down her face. Her praying roused him from his slumber. He looked up and his pale lips began to
move slightly.
"My darling Susan," he whispered.
"Hush my love," she said. "Rest . Shhhh. Don't talk."
He was insistent."Susan, " he said in his tired voice." I have something I must confess to you."
"There's nothing to confess", replied the weeping Susan. "Everything's all right, go to
sleep."
"No, no, I must die in peace, Susan. I slept with your sister, your best friend, and your mother"!
"I know," she replied...
"That's why I poisoned you."