Franco Cerrina, a former professor of electrical and computer engineering at UW-Madison, was found dead Monday at a Boston University lab. The cause of death for Cerrina, 62, isn?t yet known, but police have ruled out homicide. Cerrina, a native of Italy, had been chairman of the Electrical and Computer Engineering Department at BU since 2008 after spending 24 years at UW-Madison. He held 16 patents and was described as a leading scholar in optics, lithography and nanotechnology.