Question: when was the American mixed martial artist born who competes in the Ultimate Fighting Championship and was a star in Fight Valley?

Context paragraphs:
Devin Clark (fighter): Devin "Brown Bear" Clark (born April 2, 1990) is an American mixed martial artist.  He was signed by Ultimate Fighting Championship (UFC) after Dana White scouted him on the "Dana White: Looking for a Fight - Season 1 Episode 6" UFC web series.  He is currently competing in the light heavyweight division with Ultimate Fighting Championship.

Luke Zachrich: Luke Zachrich (born October 1, 1981) is an American mixed martial artist and former professional boxer who formerly competed in the Middleweight division of the Ultimate Fighting Championship A professional mixed martial arts competitor since 2006, Zachrich was a member of Team Forrest on the seventh season of The Ultimate Fighter, and has also fought for King of the Cage, Xtreme Fighting Organization, Bellator, and Ultimate Victory Challenge, the latter of which he was the inaugural Middleweight Champion.

Sean Sherk: Sean Keith Sherk (born August 5, 1973) is a retired American mixed martial artist and former UFC Lightweight Champion.  Sherk competed in the Ultimate Fighting Championship and was one of the first combatants to have been a championship competitor in multiple weight divisions (having also competed for the UFC Welterweight Championship).  He was the second UFC Lightweight Champion in the organization's history after Jens Pulver vacated his title 5 years earlier.  Sherk also spent time competing in the Japan-based organizations, PRIDE Fighting Championships and Pancrase; going undefeated in both promotions.  He holds one of the longest undefeated streaks in mixed martial arts history, with only four career losses, all to fellow-UFC Champions.  Sherk announced his official retirement from mixed martial arts competition in September 2013 having last fought three years prior.

Fight Valley: Fight Valley is a 2016 action film directed by Rob Hawk.  It stars Susie Celek, as well as mixed martial artists Miesha Tate, Holly Holm, and Cris Cyborg.

Miesha Tate: Miesha Theresa Tate ( ; born August 18, 1986) is an American Mixed Martial Arts Pundit and former mixed martial artist who competed in the Ultimate Fighting Championship (UFC) and is a former UFC Women's Bantamweight Champion.  Primarily known for her grappling ability, Tate became a wrestler while attending Franklin Pierce High School in Tacoma, Washington and won a state championship during her senior year in 2005.  She began her professional mixed martial arts (MMA) career in 2007, and won the bantamweight championship of the Freestyle Cage Fighting promotion in 2009.  Tate gained increased recognition in 2011, when she won the Strikeforce Women's Bantamweight Championship.  She has also won a silver medal in the FILA Grappling Championships.

Todd Duffee: Todd Duffee (born December 6, 1985) is an American mixed martial artist who competes in the Heavyweight division of the Ultimate Fighting Championship.  He trains with the American Top Team in Coconut Creek, Florida and has also competed in the Super Fight League in India, Jungle Fight in Brazil, and Dynamite!!  2010 in Japan.  In addition to his mixed martial arts career he had a role in the 2010 film .  Duffee has also appeared on the front cover of Muscle & Fitness magazine.

Kyle Bradley: Kyle James Bradley (born August 19, 1982) is an American mixed martial artist, who currently competes in the Welterweight division.  A professional mixed martial artist since 2003, Bradley is best known for his four fight stint with the Ultimate Fighting Championship.  He currently holds a record of 22–12 (1).

Michael Johnson (fighter): Michael Julian Johnson (born June 4, 1986) is an American mixed martial artist who competes in the lightweight division of the Ultimate Fighting Championship.  A professional MMA competitor since 2008, Johnson mostly competed in his regional circuit, before signing onto the Ultimate Fighting Championship to appear on "".  As of July 2017, he is #9 in the official UFC lightweight rankings.

Holly Holm: Holly Rene Holm-Kirkpatrick (born Holly Rene Holm; October 17, 1981) is an American mixed martial artist who competes in the Ultimate Fighting Championship.  She is the former UFC Women's Bantamweight Champion, and a former professional boxer and kickboxer.  She was a multiple-time world champion in boxing, defending her titles 18 times in three weight classes, and a two-time "Ring" magazine fighter of the year (2005, 2006).

Chris Lytle: Chris Scott Lytle (born August 18, 1974) is a retired American mixed martial artist, boxer and a veteran of the Ultimate Fighting Championship.  Lytle was prominently featured as a Welterweight on The Ultimate Fighter 4: The Comeback.  While he is probably best known for competing the UFC, where he held a record of 10-10, Lytle has also fought in the WEC, Pancrase, and the Cage Rage Championships He is the former Cage Rage World Welterweight Champion.  In Lytle's mixed martial arts and boxing career he was never knocked out or submitted, though he did lose in mixed martial arts competition by TKO by way of cut stoppage.

Supporting paragraphs: Fight Valley Holly Holm
Answer: October 17, 1981