A fatal collision involving a motorcyclist left the Bloor exit off the Don Valley Parkway closed for much of the afternoon, affecting southbound traffic on the DVP.

"It happened just prior to 2 p.m. on the extension that runs between Bloor Street and the access to both the Bayview extension and the Don Valley Parkway," Sgt. Tim Burrows of the Toronto Police Service told ctvtoronto.ca on Saturday.

"It sounds like the motorcyclist drifted a little bit over the centre line coming in for the last curve before making his way towards the Don Valley," he said.

The 32-year-old novice motorcyclist sideswiped one car and then hit the following northbound car head-on, he said.

"He was pronounced dead at the scene by paramedics with Sunnybrook Hospital," Burrows said.

Police did a full reconstruction of the accident, he said.

That wasn't completed until around 5:30 p.m.

The traffic fatality is the 45th in Toronto this year and the third involving a motorcycle, Burrows said.

Police say they aren't likely to file charges against the other drivers. They are asking for witnesses to come forward.