Lawyers for the man who pleaded guilty to killing his wife a year ago were in court on Tuesday to make sentencing recommendations.

Shengjun An, 44, was originally charged with first-degree murder but pleaded guilty to manslaughter on Monday.

Police were called to a home in northwest Calgary on February 7, 2010 where they found 41-year-old, Yanrong (Susan) Cheng in medical distress. She was transported to hospital where she later died.

Alain Hepner, An's Lawyer, is asking for a 5 year sentence with a two year credit for time served.

On Monday, court heard that An had discovered his wife was having an affair and the two fought physically over the course of several hours.

Her death sparked changes to the 911 operator system, because a call was actually made from the victim's cell phone more than 15 hours before police were dispatched.

Emergency operators called the victim's cell phone back right away. A man answered and a woman could be heard yelling for help in the background before the line went dead.

PSC officers called the number back twice and were eventually given an address from someone else who answered the phone.

Since then a new policy has been implemented requiring emergency dispatchers to pass on all 911 hang up calls to police if there is any possibility a person is in danger.

The crown is recommending a sentence of between 7 and 10 years.