The trial of an American man accused of killing a 40-year-old Saskatoon woman is underway at Court of Queen's Bench.

George Allgood, 49, is charged with first-degree murder in the death of his ex-girlfriend in 2006.

On July 15, 2006, police were called to a home on the 800 block of 4th Avenue N., where officers found Susan Reinhardt and 43-year-old David Ristow suffering from bullet wounds. Reinhardt died in hospital, but Ristow survived.

Allgood and Reinhardt also had a child together.

The 49-year-old suspect, who is also facing a charge of attempted murder, was arrested in North Battleford, Sask. in 2010.

RCMP used 'Mr. Big' sting

Police were able to narrow in on Allgood as a suspect during an RCMP undercover 'Mr. Big' sting.

Today in court, a video was played showing the undercover officer, posing as a 'crime boss', meeting with Allgood. After a long, tense conversation, he admitted to shooting the couple.

Defense lawyer Morris Bodnar took issue with the 'Mr. Big' tactics used in this case. In court, Bodnar said RCMP tried to intimidated Allgood into the statement, using scenarios like a mock execution and the promise of financial gain to extract the statement.

He also said there's a case before the Supreme Court asking that police stop using the stings.

"Don't forget," said Bodnar. "The Mr. Big scenarios are not allowed in any other country. Britain doesn't allow it, the United States doesn't allow it.

The trial is expected to last about two weeks.

It's not the first time Allgood has faced serious criminal charges.

In January 2010, CBC News learned that Allgood was convicted of murdering a man in the United States in 1983.