The Society of Toxicology (SOT) recently learned of the passing of Kirpal Singh Sidhu on February 10, 2011. For over 30 years, he was a scientist in the Division of Environmental Epidemiology, Michigan Department of Community Health, Lansing, Michigan. He was born in Punjab, India; immigrated to the US in 1963, and received his PhD in Toxicology from Oklahoma State University. He joined SOT in 1983 and was a member of the Comparative and Veterinary Specialty Section.