My imagination is pretty good at 3:45 in the morning. No one would have found my body for hours. Growing up in the city makes you a bit more cautious than the regular rube, I think. Probably nothing, But I was extra careful and I'm typing this now.
I think you did the right thing. Were there any other people around the donut shop? This could have been a newbie over the road driver simply wanting to ask directions to a warehouse. In other words, the driver may have been lost. Or he could have been a serial killer. I've saw lost truckers in residential neighborhoods before..they were lost.
Since he was chasing you into a residential neighborhood...he was either a psycho, or was desperate for directions. Again, you did the right thing. Sounds like a psycho to me. You may be able to find him here.
http://www.truck.net
http://www.layover.com