The episode “Hercule’s poirot Christmas“ :
“The tyrannical patriarch of a dysfunctional but wealthy family summons his adult children for a Christmas reunion, but prior to the holiday his throat is slashed apparently by one of them.”

The Hercule Poirot’s episode “The thief of the Royal ruby” (The christmas pudding) : “Poirot reluctantly agrees to help an Egyptian prince recover a valuable royal ruby that was brazenly stolen from him during the Christmas holidays.”
The pushing daisies episode “Corpsicle“ :“Ned tries to make amends with Chuck after his confession, and Emerson finds a corpse in ice.”

The West wing episode “In excelis deo” : “When a homeless veteran dies on the National Mall and his body remains uncollected for hours, Toby becomes fixated on getting him a proper burial.”
The West wing episode “Noël” : “Josh speaks to a psychiatrist about the events of the last three weeks: Toby hired musicians for the foyer, an Air Force pilot disobeyed orders, Yo-Yo Ma performed at the White House, and Josh managed to cut his hand quite badly.”
The West wing episode “Holy night” : “Toby’s estranged father appears in his office a couple of nights before Christmas. Leo and Jed find themselves trying to fix problems as well as their consciences.”
The West wing episode “Abu el Banat ” : “The entire Bartlet family tries to gather for an early Christmas dinner at the White House, but inevitable delays occur as the president must deal with an overseas crisis.”
The West wing episode “Impact winter” : “President Bartet’s attack of multiple sclerosis requires hasty reorganization of the summit in China.”
The Miss Fisher’s mysteries Christmas episode “Murder under the Mistletoe” : “Christmas in July turns deadly when the ghosts of an old Christmas mine collapse come back to haunt Aunt Prudence. Trapped by heavy snowfall in a house with a murderer means failing to solve the case could cost them their lives.”
Sources : pinterest.com and imbd.com