The fate of southern Alberta woman accused of murdering her husband is now in the hands of a Calgary jury.

Heather Wilson Duncan's husband Barry died in their Sundre-area home after being shot in the face in December 2010.

She is charged with second-degree murder, which carries an automatic life sentence with no chance of parole for at least 10 years if found guilty.

The court heard closing arguments today before the jury was charged to make its decision.

Wilson Duncan claimed the gun accidentally went off when Barry handed it to her and told her to shoot during a heated argument.

She testified she and her husband were both intoxicated that evening, saying they each consumed a full bottle of liquor plus more than a bottle of wine.

Wilson Duncan previously told the court they had both began to drink to excess after her husband retired.

"Some days we drank a great deal from morning to night,” she said.

Duncan said she had contacted an addictions counsellor on three occasions to seek help with their drinking habits.

911 call played in court

Earlier in the trial, the court heard the 911 call Wilson Duncan made the night her husband was shot. 

"I think I killed my husband.... Please come, please come right away, please come," the 911 call begins.

For the next 36 minutes she pleads with dispatchers at the other end of the 911 call to send help — telling the same story over and over again.

"He gave me the gun," she said. "We were fighting and he said it was loaded."

On the tape she said she thought he was joking.

Wilson Duncan seems disorientated in the call, and has trouble relaying her rural address to 911 dispatchers.

She later confirmed to dispatchers her husband was dead after being asked to check on his welfare.

“He’s dead, I killed him, I killed my husband ... oh God, oh God, oh God,” Wilson Duncan said in her 911 call.

Defence lawyer Jim Butlin says if it was an involuntary or accidental discharge then his client should be acquitted.

"I think the 911 tape shows she was distraught, intoxicated and quite confused," he said previously.