Luxmi attacked and killed his brother Chedi Lal with a weapon. He claimed insanity as a defense under Section 84 of the Indian Penal Code. The court analyzed Luxmi's motive, conduct before and after the incident, and found evidence of motive against Luxmi. His actions did not support being insane at the time of the offense. The court ruled that Luxmi could not claim protection under Section 84 as the law requires being incapable of distinguishing right from wrong, not just claiming to not know an act was wrong.