NTSB final report is out for the similar 560XL crash in KOVE which occurred two years prior to the CT fatal accident. Basically set the park brake and took off with it set due to distractions.
They achieved V1 and Vr but couldn't rotate, so rejected and went off the end (no injuries fortunately).
https://www.youtube.com/watch?v=PiQhxXcqGOE