Don Nakaya Nielsen

Nielsen attempted to make up for this loss later in the year with a contest against Rob Kaman, a Dutch Muay Thai stylist attaining legendary status as an international champion. Nielsen sought to match his opponent’s signature low kicks but found himself repeatedly swept by Kaman’s legs before being knocked out by a surprise right hook. The following year, Nielsen met future world champion Masaaki Satake in the latter’s debut match. Nielsen swarmed his less-experienced opponent early on but was unsettled by Satake’s repeated headbutts, eventually dropping his guard and being knocked out by a right hook.

On August 14, 2017, Nielsen underwent surgery in Bangkok to treat an infection on his legs that had caused sepsis and renal failure. During the procedure, he suffered a heart attack and fell into a coma. More heart attacks followed, and Nielsen died within two days of his admission of the hospital. He was 58 years old.

As chiropractic was not yet adopted by Thailand's Ministry of Public Health, Nielsen's enterprise brought him into conflict with authorities - at one point being arrested and charged with practicing medicine without a license and running a clinic without a permit. Though allowed to continue his business, he was required to do so under physical therapy and nursing licenses. Nielsen consequently became an activist, advocating that chiropractic be legally practiced without oversight by the Medical Council of Thailand. In 2006, as the result of various efforts, chiropractic became a legal profession in the country and Nielsen was able to practice freely.

During his career, Nielsen served within many organizations furthering chiropractic practice, including the Subcommittee of Chiropractic via the Ministry of Public Health; he served from 2005 to 2009. He was the co-founder and vice president of the Thailand Chiropractic Association, secretary of the steering committee under the Asian Chiropractic Federation, president of the Thailand chapter of the Federation International du Chiropractique de Sportif (FICS), and founder and president of the Thailand International Chiropractic Organization (TICO). He was also the founder and first president of the Chiropractic Association of Thailand and the founder of the Bio Energy Asia clinic in Bangkok.

In the following three years, Nielsen continued to fight internationally, winning the WKA International Heavyweight Championship in 1992 but still falling short of world titles. His final match took place in September 1993 at the K-1 Illusion event, for the UKF World Heavyweight Championship, against returning opponent Masaaki Satake. More experienced at this time, Satake fought primarily with counter-strikes, rarely allowing even a single one of Nielsen’s blows to go unrequited. He knocked Nielsen down three times within the opening round, leading to a TKO loss as per K-1 rules.

Nielsen's most famous sporting endeavor was a one-time event in the budding field of mixed martial arts. On October 4, 1992, he met Ken Shamrock in a mixed rules bout - the first time in Japan that a pro wrestler had fought a kickboxer in televised no-holds-barred competition. Nielsen was quickly submitted by Shamrock, who took advantage of his opponent's limited grappling experience and the fact that Nielsen had opted to wear boxing gloves. The match elevated Japanese interest in MMA competition and helped lead to the formation of Pancrase Hybrid Wrestling.

An aggressive fighter characterized by his powerful striking ability, Nielsen synthesized his boxing and martial arts skills into a formidable offensive technique. He engaged his kickboxing opponents head-on, frequently forcing them into a corner or against the ropes and pummeling them with roundhouse kicks and punches. Nielsen was capable of a more intricate approach as well, utilizing lunging attacks with precision striking reminiscent of karate point fighting. He was a knockout-focused fighter, with 22 of his 37 wins in late 1992 being the result of KO.

In May 1989, Nielsen entered world-class competition by challenging budding superstar Kevin Rosier for his WKA World Super Heavyweight Championship. With a record of 14-2, Rosier was half as experienced as Nielsen but was significantly taller and maintained a weight advantage of over 45 pounds (20.4 kilos). Frustration between the fighters rose as the number of committed fouls mounted and Nielsen slowed the match’s pace by repeatedly falling to the canvas. The fight ended in the sixth round when a visibly angered Rosier threw Nielsen onto the ring ropes and landed an unprotected blow to the face, leading to a technical knockout.

Nielsen's kickboxing success allowed an easy expansion to professional wrestling, which he participated in alongside his fighting career. A participant of the shoot wrestling style, Nielsen's matches were designed to look as realistic as possible with Nielsen wearing boxing gloves to emphasize his kickboxing background. His list of opponents from 1986 to 1993 includes ring legends Akira Maeda, Keiichi Yamada, and Yoshiaki Fujiwara. He wrestled primarily for New Japan Pro-Wrestling.

Nielsen earned a chiropractic doctorate from Cleveland University-Kansas City in 1986 and was nationally certified in 1988. He began treating patients immediately after graduation. Beginning in 1987, he traveled to Thailand to train at Muay Thai gyms, where he treated his fellow kickboxers and learned that chiropractic wasn't widely practiced in the country. He subsequently partnered with Paolo Memorial Hospital and participated in monthly charity tours – offering chiropractic treatment to far-flung and impoverished villages. Seeking to establish chiropractic as a legitimate business in Thailand, he opened Dr. Don's Center for Natural Health in March 1993.

Nielsen made his acting debut in the 1984 film Fear City, playing an uncredited role as a boxer. He upgraded to larger roles in the 1990s, playing villains in the Dale Cook vehicles Blood Ring, Fist of Steel, and Blood Ring 2.

Donald Eugene “Nakaya” Nielsen (July 4, 1959 – August 16, 2017) was an American kickboxer, professional wrestler, actor, and chiropractor. Best known for his lengthy tenure in professional martial arts, Nielsen was an international competitor who held the WKA US Cruiserweight Championship for much of his career and fought in one of the earliest mixed martial arts-style matches of Japan. As an alternative medicine practitioner, Nielsen played an active role in legalizing chiropractic practice in Thailand.

Nielsen was born in Los Angeles on July 4, 1959 to Howard and Beth Nielsen. He began his formal martial arts training at age 10, studying tang soo do under a cousin who operated a dojo owned by Chuck Norris. Competition in karate soon followed. He attended Whittier College on an athletic scholarship, playing football and majoring in pre-medicine.