Second Chair, A Stan Turner Mystery, Vol.4. The Stan Turner Mysteries, #4

It's 1981 in Dallas and Stan decides to throw a Christmas party at his home as a way of saying thanks to the clients who have sustained him during his first tumultuous year in the practice of law. As Stan's luck would have it, a client is killed in a freak accident and Stan is blamed for his death. While trying to shield himself from the wrath of the grieving widow, he's asked to defend a young woman charged with murdering her newborn child.
Since Stan has only been practicing a year, he knows he shouldn't take the case, but his client begs him to do it. Reluctantly, he agrees but enlists the aid of his former criminal law professor at SMU to be "Second Chair." He thinks everything is going to be okay now, but what he doesn't realize is that his professor is a drunk and probably won't show up for trial.