Holotape (Allen Marks)

Holotape (Allen Marks) (just called "Holotape" in-game) is a holodisk in Fallout: New Vegas that is generally encountered during the questline A Valuable Lesson.

Location
It can be found lying next to Allen Marks in the prize room of the Sunset Sarsaparilla Headquarters. This holotape tells the Courier how he died.