Theodore Landon "Ted" Streleski (1936) was an American former graduate student in mathematics at Stanford University who murdered his former faculty advisor, Professor Karel de Leeuw, with a ball-peen hammer on August 18, 1978. Shortly after the murder, Streleski turned himself in to the authorities, claiming he felt the murder was justifiable homicide because de Leeuw had withheld departmental awards from him, demeaned Streleski in front of his peers, and refused his requests for financial support. Streleski was in his 19th year pursuing his doctorate in the mathematics department, alternating with low-paying jobs to support himself.