Winnipeg police are asking the city's drivers to take a look at photos of missing and murdered persons and consider the question, "Do you know who killed me?"

The query is part of a new RCMP and police campaign which will launch on Nov. 30.

As part of the campaign, three ads will be plastered on the side of the city's public transit vehicles.

In addition to the poster asking "Do you know who killed me?," one poster will read "Help find my killer," and another will say, "Help bring them home."

Each ad will also show the images of three missing or murdered individuals, and the number for a police tip line.

Police say they hope the initiative will lead to answers in the 28 unsolved cases that are part of "Project Devote."

"We owe them (the victims) and their families these answers," Winnipeg Police Public Information Officer Const. Jason Michalyshen said. "This is a plea that, once again, we need the public's assistance."

First announced in 2011, Project Devote is aimed at solving cases involving "exploited and at-risk persons," where "foul play" is suspected, the RCMP's website says.

So far, Project Devoted has led to a conviction in one case, the murder of Myrna Letandre.

Letandre was 37 years old when she went missing in 2006. Police found her remains buried in the basement of a rooming house seven years later.

In 2014, they charged Triago Andretti with the second degree murder. Andretti, who pled guilty, is currently serving a life sentence for the killing.

Now, police and families are hoping that the new bus ads will bring in tips that could lead to more arrests, charges, and convictions.

"That small piece of information could be vital," Michalyshen said. "It could be that stepping stone to something more."

For the family of Cherisse Houle, there's hope a tip could bring them some sense of closure.

Houle was only 17 when she went missing in May, 2009. A construction crew found her body in July of that year, lying in a creek near the Manitoba municipality of Rosser.

To this day, her mother and aunt don't know who took her life.

"Anybody out there, anybody that knows what happened to my sister's daughter, please come forward," Rachel Lyons, Houle's aunt, said to CTV Winnipeg.

"It hurts me. Every day I think about my daughter. I miss my daughter," Houle's mother, Barb Houle, added. "We need closure."

Anybody with information on any of the Project Devote cases can call the project tip line at 1-888-673 3316, or Manitoba Crime Stoppers at 1-800-222-TIPS.

With files from CTV Winnipeg