Commonwealth v. Welansky, Supreme Court of Massachusetts, 55 N.E.2d 902 (1944), is a criminal case about the Cocoanut Grove fire that illustrates principles of negligent homicide and reckless homicide in the case where there is not an affirmative act, but a failure to act (omission) when there is a duty of care.
Barnett Welansky was found guilty of wanton or reckless homicide in the Cocoanut Grove fire. Welansky maintained and operated the Cocoanut Grove nightclub, knew or should have known that the club fire escapes were inadequate and in violation of building safety codes, and while Welansky was offsite, the building caught fire and hundreds could not escape and died.
The court wrote:
Usually wanton or reckless conduct consists of an affirmative act... in disregard of probable harmful consequences to another. But whereas there is a duty of care for the safety of business visitors invited to premises which the defendant controls, wanton or reckless conduct may consist of intentional failure to take such care in disregard of the probable harmful consequences to them or of their right of care."