For years, “Jeopardy!” fans have yearned to learn more about the behind-the-scenes life of their beloved host, the silver-haired, even-toned Alex Trebek. But so far he has been relatively tight-lipped about it.

In July, those fans will get new insights into Mr. Trebek in a memoir that delves into the game show host’s thoughts on topics like marriage, parenthood and spirituality, the publisher, Simon & Schuster, announced on Tuesday.

Mr. Trebek had resisted entreaties to write a book about his life for over three decades, the publisher said, but his position changed after his Stage-4 pancreatic cancer diagnosis last year prompted an outpouring of support and interest in his health.

“I want people to know a little more about the person they have been cheering on for the past year,” Mr. Trebek writes in the book, titled, “The Answer Is …: Reflections on my Life.”