Kathryn Leigh Scott (1.16 The Black Orchid) wrote a memoir called Last Dance at the Savoy, but I'm not sure how much it covers her acting career as it seems to focus on her husband who had progressive supranuclear palsy. She wrote a further three books about it: Now With You, Now Without, The Happy Hours, and A Welcome Respite.
Allan Rich (2.4 From Moscow to Maui) wrote 'A Leap From The Method: An Organic Approach To Acting' in 2007 but the first part of the book was his autobiography.
Soo Yong (2.5 and 2.6 Memories Are Forever) does not have an autobiography, but her story is told in the Hawaiian book 'Chinese Women Pioneers in Hawaii' (2002), when she worked in Hollywood with the likes of Clark Gable and Joseph Cotten. Magnum PI was her final screen appearance.
Missed one. Ron Masak (1.6 Skin Deep) better known as the Sheriff in Murder She Wrote, has written a book, 'I've Met All My Heroes from A to Z' telling stories of the people he has met throughout his life.
Over halfway through Season 2 and and I've only found a couple. You'd think that Kenneth Mars, Lance LeGault, Roy Dotrice, Vic Morrow, Darren McGavin, Vera Miles, Elisha Cook Jr, Tyne Daly and others would all have written memoirs. But they haven't.
Sharon Gless's is out next year. Have to look out for that one.
Nancy Lee Grahn (2.15 Try To Remember) is writing her memoirs. She confirmed this in 2019 and she's still writing them. Best known for Santa Barbara and General Hospital.
Former American football player Dick Butkus (2.17 One More Summer) wrote about his experiences playing the game during the 1971 season in Stop-Action (1972) but wrote a more comprehensive autobiography, Flesh And Blood, in 1997.
Dana Wynter (2.19 Double Jeopardy and 3.8 Foiled Again) published her memoirs, 'Other People Other Places: Memories of Four Continents' in 2005. Apparently it was limited to only 1500 copies.
Terrence McDonnell, who co-wrote the episode 1.7 Never Again...Never Again, is working on his memoirs. He's the only behind the scenes crew member I have found so far. He's mainly known for his work on Battlestar Galactica and The Six Million Dollar Man.
Beverly Garland (2.22 Three Minus Two), never wrote her memoirs, but a book on her life and career was published in 2012 - 'Beverly Garland: Her Life and Career' by Deborah Del Vecchio.
Denny Miller (also from 2.22 Three Minus Two) wrote his autobiography, 'Didn't You Used to Be What's His Name?' in 2004. He was probably best known for Wagon Train.