Herweg was born to Liane Reiger-Herweg, who was ofGerman andNative American descent, and Smith Hart in 1993. Herweg's father is part of a family ofUlster Scot andIrish heritage through Smith's father Stu Hart. Herweg also hasGreek as well as more Irish ancestry through his paternal grandmotherHelen Hart.[6][7][8][9][10][excessive citations] He has an older half-brother namedMichael on his mother's side who is also a professional wrestler and three half-siblings on his father's side named Tobi, Tania and Chad, as well as a foster brother named Steven from his father.[11] His middle name Dean is in honor of his uncleDean Hart who died in 1990.[12] He also shares his first name with his deceased cousinMatthew Annis. Herweg's mother and father separated before he was born but they shared custody, he and his father lived together in the attic of the famedHart House in Calgary.[13] In 2001 he and his father were among the Hart family members who attended WWF Monday Night RAW to commemorate his uncleOwen who had died two years earlier.[14] Herweg's mother died on his thirteenth birthday on January 28, 2006[15] after which he was put into foster care due to Canadian authorities deeming his father's career too unstable.[16] After some time Herweg was put in the care ofStacey Olaszak, his father's long time partner.[17][18][19][20][11] Herweg studied to be a stonemason.[21] As a member of the Hart family Herweg has many relatives in the industry, his cousinsNatalie Neidhart,Harry Smith,Teddy Hart,Torrin Hart, andBruce Hart Jr. are contemporaries in the ring while his cousinLindsay Hart is an on screen personality forElite Canadian Championship Wrestling.[22]
After being separated from his father's side of the family after the death of his mother, Herweg reconnected to them through professional wrestling, deciding to join the industry as soon as he got the chance.[23] Matthew was trained by his father and cousins Teddy Hart and Harry Smith. He debuted in 2012 for his family's promotion, which was known as Stampede Extreme Sports at the time, for the 100th anniversary of theCalgary Stampede. In his first match he wrestled with Teddy and Harry.[5] At later events he would appear with his cousinsTory andBruce Hart Jr. among otherStampede Wrestlingalumni.[24][25] By March Matt was wrestling in Mecca Pro Wrestling[26] in Ontario for several dates[27][28] and by August he wrestled against a wrestling champion for the first time with KC Andrews who held the Big West Wrestling Television Championship.[29][30][31] In September he worked as a tag team wrestler in a storyline for Thrash Wrestling where his partner betrayed him to become the inaugural Trash Wrestling Tag Team Champion.[32] In 2016 Hart participated in the "Canadian Death Tour", becoming the first Hart family member to do so.[33] 2017 saw Hart traveling to theUnited Kingdom to wrestle.[34][35] In May 2022 Hart performed for his cousinDallas Hart's promotion Dungeon Wrestling.[36]
Hart debuted on the 2012 sneak peek of the promotion but had to take a year off from all wrestling afterwards due to injury.[37] He returned in January 2013[38][39] and was a regular performer for the promotion[40] until 2019.[41]
Hart began wrestling forReal Canadian Wrestling in 2015.[42][43] He wrestle for the promotions charity show in June that year.[44] In 2017 Hart won his first championship, catching the RCW Tag Team Championship together with tag-team partner D. Dwight Davis as part of the group Hard To Kill.[45] In 2018 Hart was given his uncleDynamite Kid (Tom Billington)s' robe by his auntMichelle Billington in a match of theSmith Hart Memorial Tournament.[46][47] He later got involved in a major storyline with Real Canadian Wrestling's topheel wrestler,[48] Heavy Metal, after he destroyed Harts trophy for winning the Smith Hart Memorial Tournament and destroyed Smiths final letter to his children before Matt could read it.[49] During RCWs collaboration withImpact Wrestling Hart had a feuded withRaj Singh, the son of aGama Singh who wrestled for Harts grandfather, the feud was popular and heated up the promotion.[50][51][52][53] In January 2020 Hart captured his first singles championship when he won the RCW British Commonwealth Championship.[54] Hart lost the title on March 6, 2020 to his former tag-team partner Davis.[55][56]
In 2016 Herweg and his father were the subject of theTelus original documentaryHart Still Beating which concerns his childhood, the loss of his mother, his father's then recent diagnosis with terminal cancer and their attempt to grow closer to each other through professional wrestling.[64][65]
^Kreikenbohm, Philip (March 6, 2020)."RCW Cruel Intentions".CAGEMATCH – The Internet Wrestling Database.Archived from the original on March 6, 2023. RetrievedMarch 6, 2023.