The mother of a man shot to death in a parkade more than 11 years ago in what investigators believe was a targeted and financially motivated attack is asking for anyone with information to come forward.

Allan Teather was 22 when he was shot in a southwest Calgary condominium complex in January 2008.

Andria Teather released a video Thursday asking for the public to help bring her son's killers to justice.

"The Allan that we all knew was a typical, rambunctious child and teenager, who often made some mistakes and poor choices, but we all loved him and he us. As parents we knew that his good traits far outweighed the bad and we believed he had the potential to become a fine young man," she said.

Teather said she couldn't have imagined that her son's life would be cut short and added that the family is "shattered with the loss of him."

"We need to understand what happened to him. We are aware that more than one person was involved in Allan's death and there may be people out there who have information about this crime."

Police made their first arrest in the case in August. Calgarian Brian Cheng, 34, faces a charge of first-degree murder.

Two men who were arrested in Vancouver earlier this month are still under suspicion, but were released without any charges being laid.

Police said they believe other individuals were involved in the shooting, and have found a gun and a vehicle thought to have been used in the crime.

"The gun and the vehicle are currently undergoing forensic examination. Investigators believe that more than one person was responsible in the murder and anticipate that more people will be charged," said Staff Sgt. Colin Chisholm.

Chisholm said it's not unusual for breaks to come in a cold case.

"We don't close files. There's always hope," he said.

"We're looking for information from the public, from people to come forward. They may feel it's insignificant, but it may be the tipping point that leads us into a direction where we can get to a point where we can lay charges."

Anyone with information on the incident is asked to contact the Calgary Police Service's homicide unit through its tip line at 403-428-8877, the non-emergency line at 403-266-1234 or anonymously through Crime Stoppers.