What happened to Kelsey Grammer’s sister Karen? Learn how her tragic 1975 murder shaped his life and inspired his new memoir, "Karen: A Brother Remembers."

In writing about his late sister Karen, Emmy-winning actor Kelsey Grammer recalled details of his childhood he hadn’t thought about in decades. “Recall is just extraordinary,” Kelsey, 70, exclusively tells Closer.

Kelsey Grammer has released a memoir about his sister Karen on the 50th anniversary of her murder. He says writing the book helped him forgive himself.