natural athleticism. He also studied Jeet Kune Do before his UFC debut. Shamrock's improved cardio, along with an excellent defensive guard work learned from Tsuyoshi Kohsaka, enabled him to survive against superior opponents in order to seek for openings, which he capitalized on with aggressive strikes and submissions. Though not the first one in history, he was considered one of the greatest earlier mixed martial artists, excelling in all the fields of the game. Personal life Shamrock was married to a woman named Amy Warren until their separation and subsequent divorce in 2019. Together they have one child, a daughter named Nicolette who was born on April 24, 2008. Shamrock also has a son named Frankie from a previous marriage. Shamrock runs a franchise of schools, a merchandising company, Frank Shamrock, Inc. (a personal asset management company), MMA Entertainment, and Mixed Martial Arts For Law Enforcement (a law enforcement training business). In 1998, Shamrock had a falling out with his brother Ken and his father Bob; they would not communicate again until Bob became terminally ill years later. In separate interviews aired January 18, 2007 by Sherdog.com's Beatdown radio show, both Frank and Ken said they remain estranged - Frank claimed Ken has spurned all attempts at reconciliation; Ken accused Frank of treating their father poorly. As seen on Frank's Spike TV documentary, Bound by Blood, he and Ken have reconciled. On January 14, 2010, Bob Shamrock died due to health complications from diabetes. In an interview with Sam Caplan of sportsline.com, Shamrock revealed he felt concerned with Ken's training methods, and when he confronted Ken, he was told "You don't have what it takes, you're not going to be a world champion and I want you to run my gyms for the rest of your life." This spurred him on to leave which led to the estrangement of both Ken and Bob (who took Ken's side in the disagreement). He also stated that he would be happy to fight against Ken, should the opportunity arise. Shamrock is a commentator and fighter on the EA Sports MMA video game which was released in 2010. Shamrock is also featured in the award-winning documentary on the sport of mixed martial arts titled Fight Life, released in 2013. The film is directed by James Z. Feng and produced by RiLL Films. Shamrock landed a guest role as Hammer on Walker, Texas Ranger and