EXCLUSIVE: Parenthood alum Sam Jaeger has joined the cast of CBS All Access' Why Women Kill, a darkly comedic drama from Desperate Housewives creator Marc Cherry, Imagine Television Studios and CBS TV Studios. Created by Cherry, Why Women Kill details the lives of three women living in three different decades -- a housewife in the '60s, a socialite in the '80s and a lawyer in 2018 -- each dealing with infidelity in their marriages. The series will examine how the roles of…