Matlock (1986)

S4E4 The Best Seller

After Elizabeth, a close friend of renowned author Cynthia Slayton, is discovered dead from taking Cynthia's allergy medication, attention turns to Philip, Cynthia's beleaguered husband and a friend of Julie's. As Julie investigates to help prove Philip's innocence, she uncovers unsettling truths that suggest the Slayton household is hiding more than it appears.