Final answer:
In the Jean Gianini murder trial, Psychologist Dr. Henry Herbert Goddard testified as an expert witness, asserting Gianini's legal insanity.
Step-by-step explanation:
The Luetgert Murder case, formally known as the Case of Jean Gianini, is a historical legal event wherein Jean Gianini murdered Lydia Beecher in Poland, New York, in 1914. Psychologist Dr. Henry Herbert Goddard was called as an expert witness to testify on Gianini's mental state, arguing that Gianini was legally insane at the time of the crime. This early use of forensic psychology highlighted the evolving role of mental health experts in legal proceedings and remains a notable example of the intersection of psychology and law.