Murthel Cyrill Dwyth Groenhart (born October 10, 1986) is a Dutch-Surinamese kickboxer and mixed martial artist.

He made his SLAMM debut in 2006, losing both of his fights with the organization, including a decision loss to Leroy Kaestner at B-Klass level.

In 2008, Groenhart was invited by the K-1 organization to take part in an eight-man tournament, which had originally been intended for heavyweights but was changed later for fighters around the 75 kg bracket.

Groenhart won the competition in spectacular fashion, dispatching all three of his opponents by stoppage on the night to take the title in Milan.

He lost his debut to It's Showtime Reality winner Sem Braan but impressed enough to be invited back for further matches.

[4] Although an impressive fighter with a good knockout ratio, Groenhart has had up and down performances within the organization, winning fights against the likes of Yassin Boudrouz and Joep Beerenpoot by knockout, but losing to Vladimir Moravcik and being knocked out by Ali Cenik, fights he should have been expected to do better in.

[13][14][15][16] Groenhart lost to Davit Kiria via unanimous decision at Glory 10: Los Angeles - Middleweight World Championship Tournament in Ontario, California, United States on September 28, 2013.

[24][25][26][27] Replacing his stablemate Artur Kyshenko who conceded that he would be unable to make the contracted weight of -71 kg/156 lb,[28] Groenhart stepped in to face Dzhabar Askerov at Legend 3: Pour Homme in Milan, Italy on April 5, 2014.

He beat Nicola Gallo by TKO in the second round, as the fight was called by the ringside doctor due to a cut.

[55] Groenhart rebounded from his title loss with a second-round TKO finish of Mohammed Jaraya,[56] but dropped a split decision in his next fight to Alim Nabiev.

[63] The fight with Doumbe was indefinitely postponed, as main event fighter Badr Hari contracted COVID-19[64] and due to a partial lockdown imposed by the Dutch government.

[73] Groenhart was scheduled to make his mixed martial arts debut against Ullubiy Ataev at Levels Fight League 3 on October 10, 2021.

[76] Groenhart was expected to face Ammari Diedrick at Levels Fight League 4 on November 28, 2021.

[78] Groenhart won the bout after knocking Kemna down with a flying knee and then finishing him with ground and pound.

[81] Groenhart was booked to face Max Siewruk at Levels Fight League 6 on October 2, 2022.