WEll, i just figured out Aunt Kate is phyco path.She chained Derek up in the basement and was said to Allison,"Isn't he beautiful!" When Derek was roaring and showing his teeth.At least Scott is ok and Derek is not all bad.But, still Kate is gonna lick Dereks abs soon.So heres what we found out throughout the many episodes.
1.Derek has a sister that was cut in half
2.He lives in a burnt down house
3.He is a well known were-wolf in the lives of were-wolf hunters
4.He is a crimnal