GREELEY, Colo. -- The first-degree murder trial of a Greeley woman charged with killing the wife of her lover will likely be moved to nearby Larimer County because of extensive pre-trial publicity and because many of the players in story are law enforcement officials.

Shawna Nelson is charged with the ambush slaying of Heather Garraus in Greeley on Jan. 23. Nelson is the wife of a former Weld County investigator. Garraus was the wife of a Greeley police officer. Nelson gave birth to a boy who was allegedly fathered by Ignacio Garraus, the husband of the slain woman.

Nelson's husband, Ken Nelson, faces a related charge in the case of tampering with evidence after witnesses said they saw him stop his wife after the shooting and remove something from her pickup truck before other police arrested her.

The gun used in the slaying has never been found.

The case has attracted widespread coverage and Weld County District Judge Roger Klein is expected to rule soon on a change of venue in the trial. Klein is also expected to rule whether he will allow testimony in the trial about other affairs that Nelson allegedly had with local law enforcement officers.

On Thursday, prosecutor Cliff Riedel asked the judge to allow testimony in the trial from witnesses who claim Shawna Nelson threatened to violently deal with women she rivals.

Riedel said the testimony would indicate that Nelson said she would hide in bushes before leaping out and shooting the wife of a deputy sheriff with whom she was having an affair. Riedel said in another instance that Nelson said she would kill the dogs of a Weld County prosecutor who was dating her husband.

Heather Garraus was shot in the parking lot of the credit union where she worked as she walked to her car. Witnesses said the shooter was wearing a mask and fled in a pickup. Nelson was arrested in a pickup a short time later near her home.

Her first-degree murder trial is set to begin in November.