Undercover officers investigating the Gordon Seybold death in Whitehorse said they got numerous confessions from their key suspect.

An undercover police co-ordinator testified in the Yukon Supreme Court murder trial for Christina Marie Asp.

He says Asp made confessions within weeks of being lured into their "mock" crime family.

The Alberta undercover co-ordinator said female officers first befriended Asp in a Calgary food mall in February 2009.

Soon after, they enlisted Asp to secretly photograph a business man suspected of cheating on his wife.

Their next ruse, jurors heard, left a big impression.

Jurors heard that Asp accompanied the undercover female officers to Edmonton where they purchased a brand new Cadillac and delivered it to a supposed uncle being released from a Saskatchewan prison.

Asp was eventually told the car was a reward for taking the fall for a murder.

Within weeks, they said Asp was delivering smuggled guns and making criminal admissions to undercover officers she thought were gang members.

Some of those admissions were recorded.

Over the next six months, Asp was sent on errands across the country, believing she was now employed by a powerful crime family.

Jurors are expected to hear from a number of those undercover officers as the trial continues.

Police ruse inspired by Sopranos TV show

Undercover investigators said a Hollywood television script prompted their plans to gain Asp's trust.

When the police were tasked with investigating Christina Asp, their co-ordinator worried Asp might not fall for their tactic known as a 'Mrs. Big' sting.

It employs undercover officers posing as a crime syndicate and is meant to entice the suspect to admit past offences.

"But we watch a lot of television," the undercover boss told Whitehorse jurors this week.

Court heard that an episode of the popular mob television show The Sopranos inspired the twist. In the episode, the lead character Tony Soprano flies to Italy to meet a crime family boss, which turns out to be a woman.

The Alberta police co-coordinator said a 'Mrs. Big' scenario had never been tried before.

Over the course of the next six months, at least 21 undercover operators, many of them women, were employed to befriend Asp and gain her trust. The officers said in court that Asp seemed very impressed by the fabricated female mob boss.

Their identities are protected under a court order as they testify.