Racial or ethnic bias was not believed to be involved, investigators said.
The attack appeared to unprovoked.
It happened near the Dale Street Station.
There is 'considerable' debris at the scene.
The fatal accident happened just after 3 p.m. Friday.
Mike Augustyniak was in the Warehouse District Monday morning.
It would halt trips between 2 a.m. and 4 a.m. to tackle various issues.