who is heather sinclair?

Heather Sinclair is a made up character. The producers made her up and stuck her in there. She was suppose to be like the mean girl of the school. Now Holly J Sinclair {her sister} goes to degrassi. Holly J went to Lakehurst but that school burnt down over summer so now everyone from Lakehurst is in Degrassi and the two schools do not get along, because someone from Lakehurst killed JT. If you have any other questions just ask! I seriously know like everything degrassi!

Heather Sinclair was never actually shown on Degrassi to my knowledge. I still watch old reruns more than I do the newer episodes and I have never actually seen her. She is spoken of, but never seen.

The first poster hit the hammer on the nail (or whatever that cliche is). She's the "stuck up" girl that everyone always refers to - but we've literally NEVER seen her face on the show. It's kind of bizarre, and funny, actually.