Ruth Díaz Muriedas was born in Reinosa, Province of Santander, on 25 January 1975.

[3] She featured afterwards in the films Para entrar a vivir [es] and El calentito.

[6] Some of her early television roles include performances in Al salir de clase (2001), Hospital Central (2003), Amar en tiempos revueltos (2009), Los misterios de Laura (2010) and Cuéntame (2012).

[7] After some time relatively distanced from the acting profession with no major roles (due to her pregnancy and the economic crisis, although she made her directorial debut with the 2013 short film Porsiemprejamón), she returned to cinema playing the role of Ana in the 2016 film The Fury of a Patient Man,[6][8] which earned her recognition and awards.

[7] In 2018, she starred as Mercedes Carrillo in the third season of Locked Up and was also cast for the role of Laura in El pueblo.