Episode 26 of "Tru Calling"
s02e06 Twas the Night Before Christmas...Again

This episode is set on Christmas Eve. Tru arrives for work at the morgue to find a dead Santa, who doesn't ask for help. Turns out he died of natural causes while going to deliver Christmas presents to a kids' home where Davis' friend Carrie is working. Tru and Harrison have arranged to meet for Christmas Eve dinner, and while confirming this he says he believes their father, Richard, is cheating on his new wife Jordan. Harrison follows Richard and blusters in on a meeting between Richard and Jack, and realises they're working against Tru. When he confronts his father, Richard almost kills him. Tru is angry that Harrison stood her up for their Christmas Eve meal, and has gone to the school lab to work. Harrison escapes from his father and rings Tru to warn her, but before he can do so, one of the anatomy bodies at the school, dead for six months, asks for Tru's help and the day rewinds. This time, Tru has nothing to go on – the school lab bodies are kept strictly unidentifiable to protect anonymity. Davis suggests the only option she has is to ask Jack for help, as he gets flashbacks of the victim's last day as they day rewinds. At length she agrees to ask him, and he also agrees, as nobody else is due to die that day. Together they trace the body as that of a murder victim, and work out that the victim's family is out to take revenge on her supposed killer that day. The victim asked for Tru's help to ensure her daughter doesn't spend life in jail for attempted murder. Tru and Jack prevent the attack and unmask the real killer and begin a thaw in their relationship. Naturally, Jack takes advantage of the rewind day to warn Richard to cover his tracks from Harrison so Tru never finds out they're working together, and Davis uses his rewind day knowledge to help out Carrie with the kids' home, leading to his telling her about Tru.