Rochester N.Y.- The sister of accused killer Clayton Whittemore says their father brutally beat them for much of their lives.

Samantha Whittemore testified in her brother's trial yesterday that their father would hit and kick them for small infractions, causing serious injuries in some cases.

Defense attorneys say the father's abuse led to the emotional issues that caused Clayton Whittemore to kill his girlfriend Alexandra Kogut in her College at Brockport dorm room.

The trial could go to the jury this week.