Nova Scotia's chief firearms officer, John Parkin, is providing details about firearms licensing practices.

The inquiry has heard that Lionel Desmond believed the drug had helped reduce his anxiety and depression, while virtually eliminating his suicidal thoughts.

Dr. Faisal Rahman testified that Desmond said he had come to the hospital because he was suffering from the symptoms of the disorder after having an argument with his wife Shanna.

Lionel Desmond killed his mother, wife and 10-year-old daughter before turning the rifle on himself in January 2017.

Cpl. Gerry Rose-Berthiaume testified that witnesses said Lionel Desmond had struggled to cope after returning from war and had conflicts with his spouse that seemed to spiral out of control after a New Year's Eve incident.

Lawyer Stuart Hayne said Desmond met with Dr. Justin Clark in the hospital's emergency room, where Clark noted Desmond was not in distress and did not have any suicidal or homicidal thoughts.

The hearing into the death of Lionel Desmond, his mother, wife and daughter will resume in Guysborough, N.S., on Monday.

Lawyers, government officials and relatives had gathered in a Guysborough, N.S., municipal building for the inquiry that also aims to determine what can be done to prevent similar tragedy.

On Monday a fatality inquiry that will try to determine what happened to Lionel Desmond and what can be done to prevent similar tragedies

The inquiry will determine the circumstances under which the deaths of Lionel Desmond, his mother, his wife and their daughter occurred.