A 55-year-old Innisfail man has been arrested and charged with first-degree murder in connection to the death of an Innisfail woman killed by an exploding package last year.

Victoria Shachtay, 23, was killed on Nov. 25, 2011, when a parcel delivered to her home exploded.

RCMP say on Friday and into the weekend, investigators executed a search warrant at the accused's home in Innisfail.

They announced Sunday that Brian Malley, 55, of Innisfail, has been charged with one count of first-degree murder.

Malley is also facing one count of causing an explosion of an explosive substance likely to cause serious bodily harm, death, or serious damage to property and one count of sending or delivering to a person an explosive device.

Shachtay was paralyzed in a car crash and was confined to a wheelchair at the time of the explosion.

She had been living in a townhouse complex with her seven-year-old daughter and a live-in care worker when the explosion occurred.

RCMP have been investigating Shachtay's death for six months.

Police say at its peak, the investigation involved more than 70 investigators.

"Investigations like this one are challenging, largely because of the complexity and the coordinated effort which is so critical," Insp. Garrett Woolsey, with RCMP Operations Officer with the Serious Crimes Branch, said in a release.

"In this case, assistance from support and specialized units was significant. These arrests come as a result of that help and the relentless determination of our investigators to find those responsible for Victoria Shachtay's death."

Malley is in custody and will appear in Red Deer Court on Monday.

RCMP are also expected to talk about the charges and speak to media on Monday.

The investigation continues and RCMP are asking anyone with information to contact local RCMP or Crime Stoppers at 1-800-222-TIPS (8477).