06/02/2014 07:12 GMT | Updated 06/02/2014 07:59 GMT

Parting Words: Haunting Artwork Depicts Death Row Prisoners' Last Words (PICTURES)

A photographer has created a portrait series with a haunting twist.

The images below are mug shots, with the faces made not of pixels or pigment – but of the last words from prisoners on death row.

California-based photographer Amy Elkins exchanged letters with several men on America's death rows as a part of her "obsessive" project.

Chilling statements from "I am innocent," to "I will wait for" are revealed in an extensive venture that examines capital punishment and solitary confinement in the United States.

The artist has not yet updated her project to include America's latest execution – a woman convicted of torturing and killing a mentally impaired man she lured to Texas with the promise of marriage.

Suzanne Basso, 59, was put to death Wednesday evening in a rare execution of a female prisoner.

Before being put to death, Basso told a warden who stood near her, "No sir," when asked to make a final statement. She appeared to be holding back tears, then smiled at two friends watching through a window. She mouthed a brief word to them and nodded.

Below is a selection of Ms Elkins' work:

Karla Faye Tucker: Executed Feb. 3, 1998; Age 38

Elliot Johnson: Executed June 24, 1987; Age 38

Ignacio Cuevas: Executed May 23, 1991; Age 59

David Goff: Executed April 25, 2001; Age 31

Robert Black Jr: Executed May 22, 1992; Age 45

Samuel Hawkins: Executed Feb. 21, 1995; Age 52

Leonel Herrera: Executed May 12,1993; Age 45

Miguel Richardson: Executed June 26, 2001; Age 46

Richard Beavers: Executed April 4, 1994; Age 39

Edward Green: Executed Oct. 5, 2004; Age 30

Tommie Hughes: Executed March 15, 2006; Age 31

Javier Cruz: Executed Oct. 1, 1998; Age 41

Willie Shannon: Executed Nov. 8, 2006; Age 30

Robert Thompson: Executed Nov. 19, 2009; Age 34

Randall Hafdahl Sr: Executed Jan. 31, 2002; Age 48

Franklin Alix: Executed March 30, 2010; Age 34

Robert Coulson: Executed June 25, 2002; Age 34

Luis Salazar: Executed March 11, 2009; Age 38

Allen Janecka: Executed July 24, 2003; Age 53

Mathis Milton: Executed June 21, 2011; Age 32

Vincent Gutierrez: Executed March 28, 2007; Age 28

Edgar Tamayo: Executed Jan. 22, 2014; Age 46

Photo gallery A History Of Capital Punishment In Texas See Gallery