Daughter of director Christopher Shelton

Ranked #98 in Stuff magazine's "102 Sexiest Women In The World" (2002)

Studies acting with Ivana Chubbuck.

Engaged to producer Beau Flynn. [July 2001]

Her high school prom date was with her boyfriend at the time - "Buffy the Vampire Slayer" (1997) actor, Nicholas Brendon. He bought her 100 roses, wore a tux and drove a black convertible Mustang. Marley said that he "totally did it right".

She was announced for the part of "Annabeth Schott" in "The West Wing" (1999)'s 6th season but was replaced by actress Kristin Chenoweth when the character was aged a bit and submitted to a few changes.

Sister of Samantha Shelton.