Death in Small Doses is a 1995 American true crime television film directed by Sondra Locke and written by Scott Swanton. It was produced by Robert Greenwald Productions and stars Richard Thomas, Tess Harper, Glynnis O'Connor and Shawn Elliot. The film is a dramatization of the 1991 death of wealthy Dallas resident Nancy Lyon (played by O'Connor) by arsenic poisoning, a crime for which her husband Richard Lyon (Thomas) was the police's main suspect.