Edmonton police are investigating after a traffic fatality in downtown Edmonton early Thursday morning.

Police say a 50-year-old woman died after an incident involving a garbage truck near 100th Avenue and 112th Street around 7:30 a.m.

Ghost bike

Chris Chan of the Edmonton Bicycle Commuters Society places a 'ghost bike' near where the woman was killed. (James Hees/CBC News )

The woman was on her bike, wearing a helmet, travelling east down 100th Avenue. The garbage truck was travelling in the same direction and struck the woman when it turned right onto 112 Street. 

Claire Ethier had just gone outside with her book to enjoy the weather. She saw the cyclist riding on the road close to the curb.

"I saw her topple over on her bike and the bike landed half on the road and half on the curb and she was just sort of laying on the road," she said. 

Bystander Chris Wintle said he was walking down the street when he noticed a crowd of people huddled around the woman.

With assistance from a 911 operator, Wintle performed CPR on her until EMS workers arrived. 

He said the incident has left him shaken.

"I'm a cyclist, I ride my bike a lot and having actually seen and felt the victim, it's a little bit upsetting."

East- and westbound traffic along 100th Avenue was shut down while police investigated.

The driver of the truck, a 47-year-old man, was not hurt.