He made his acting debut in the popular teen drama Clase 406, playing the role of Kike González. In 2004, he followed Clase 406 with another teen drama titled Corazones al límite co-starring Sherlyn and Sara Maldonado. He then played the role of the older Andrés Romero in the telenovela Barrera de amor starring Yadhira Carrillo. He starred along former flame Sherlyn in Mexico’s own version of Grease entitled Vaselina.

Diaz signed on in 2006 with Pedro Damian, (creator of Clase 406) to be Alexander Von Ferdinand, the main male protagonist for the teen telenovela called Lola…Érase una vez, co-starring Eiza González and Grettell Valdez which premiered on February 26, 2007 on “Canal 5” in Mexico.

In 2007, he began dating actress Kate del Castillo, and they were married on August 29, 2009 in Las Vegas, Nevada. A religious ceremony was later held in the Episcopal Church in San Miguel de Allende, Mexico on September 5 of the same year. They announced their separation in July 2011 and were later divorced.

In 2008 he debuted as a designer and entrepreneur with the clothing brand ‘Perra’.

Apart from acting, Díaz is also a singer and he released his first album titled “Enamórate de mí” in June 2009. His second album self-titled “Aaron Diaz,” was released in 2011.

In 2010 he released a 2011 calendar with exclusive, artistic, and original photos of himself. The success of the first calendar caused him to release a 2012 version in December 2011.

In November 2011, Díaz made his debut in an American television show in the ABC series Pan Am, playing the role of Miguel, a dashing, charming, and wealthy entrepreneur in the episode ‘Unscheduled Departure’.

Díaz began dating his El Talismán co-star Lola Ponce in 2012. They have two daughters: Erin (born February 2013) and Regina (born August 2014) and got married in 2015, in a private ceremony held in Morocco.

In 2016, Díaz was cast in the ABC thriller series Quantico in the recurring role of CIA recruit, León Velez.