A jury has been told how three crucial minutes became the difference between life and death for a 95-year-old woman who was fatally tasered by a police officer.

Senior Constable Kristian White tasered 95-year-old Clare Nowland, but the decision to find him guilty of manslaughter was whether or not his actions were reasonably necessary.

Senior Constable Kristian James Samuel White discharged his stun gun at Clare Nowland in a treatment room at Yallambee Lodge aged-care home in the southern NSW town of Cooma during the early hours of May 17, 2023.