![Uncredited This cover image released by Dey Street Books shows "You Never Know" a memoir by Tom Selleck with Ellis Henican. (Dey Street Books via AP)](https://mapi.associatedpress.com/v2/items/386e61b653d44c41b270bd4c935e4741/preview/preview.jpg?s=680x&wm=false)
This cover image released by Dey Street Books shows "You Never Know" a memoir by Tom Selleck with Ellis Henican. (Dey Street Books via AP)
![Matt Sayles FILE - The cast of "Magnum PI," from left, Roger E. Mosley, Tom Selleck, and Larry Manetti appear backstage at the TV Land Awards in Universal City, Calif., on April 19, 2009. (AP Photo/Matt Sayles, File)](https://mapi.associatedpress.com/v2/items/3f7d5bbc6c1b4a99b5d54eb938a39108/preview/preview.jpg?s=680x&wm=false)
FILE - The cast of "Magnum PI," from left, Roger E. Mosley, Tom Selleck, and Larry Manetti appear backstage at the TV Land Awards in Universal City, Calif., on April 19, 2009. (AP Photo/Matt Sayles, File)
![Willy Sanjuan FILE - Tom Selleck, left, and Jillie Mack appear at the "The Carol Burnett 50th Anniversary Special" in Los Angeles on Oct. 4, 2017. (Photo by Willy Sanjuan/Invision/AP, File)](https://mapi.associatedpress.com/v2/items/688058a58fa042309aa8dc33e4337d3e/preview/preview.jpg?s=680x&wm=false)
FILE - Tom Selleck, left, and Jillie Mack appear at the "The Carol Burnett 50th Anniversary Special" in Los Angeles on Oct. 4, 2017. (Photo by Willy Sanjuan/Invision/AP, File)
![Dan Steinberg FILE - Actor Tom Selleck arrives at the 15th Annual Entertainment Industry Foundation Revlon Run/Walk For Women in Los Angeles on Saturday, May 10, 2008. (AP Photo/Dan Steinberg, File)](https://mapi.associatedpress.com/v2/items/effd396387de42228be8f9f61d0d1738/preview/preview.jpg?s=680x&wm=false)
FILE - Actor Tom Selleck arrives at the 15th Annual Entertainment Industry Foundation Revlon Run/Walk For Women in Los Angeles on Saturday, May 10, 2008. (AP Photo/Dan Steinberg, File)
![Uncredited This cover image released by Dey Street Books shows "You Never Know" a memoir by Tom Selleck with Ellis Henican. (Dey Street Books via AP)](https://mapi.associatedpress.com/v2/items/f3ef23ee51e540fa9e9ed32480ab48bc/preview/preview.jpg?s=680x&wm=false)
This cover image released by Dey Street Books shows "You Never Know" a memoir by Tom Selleck with Ellis Henican. (Dey Street Books via AP)