Authorities are asking for your help as they investigate a fatal hit and run motorcycle accident. 

Sacramento Police are still looking for the driver of a van that collided with a motorcycle last Tuesday killing the 18-year-old cyclist.

'The motorcyclist was actually northbound on Del Paso Blvd. approaching Frienza, and a van entered into the roadway and hit the motorcyclist. The van then pulled over and the driver fled,' reports Officer Michele Gigante.

She says there were at least a dozen potential witnesses in or around the area at the time. 'Both of the people we're reaching out to - trying to find, trying to identify - so they can help piece together exactly what happened and help us solve this crime.'

Investigators don't think speed was a factor in the accident. They're not sure if alcohol was involved.