[11] Hein was born in Elsdorf and became interested in martial arts after watching a Bruce Lee movie.
[11] Two years before turning professional in 2009, Hein debuted as an amateur on February 24, 2007, as he faced Ulf Fritzmann at MMA Berlin: Tournament 3.
[16] Hein made his promotional debut against Drew Dober on May 31, 2014, at UFC Fight Night: Munoz vs. Mousasi.
[21] Hein next faced promotional newcomer Yusuke Kasuya on September 27, 2015, at UFC Fight Night 75.
[27] Hein was expected to face promotional newcomer Zabit Magomedsharipov in a featherweight bout on September 2, 2017, at UFC Fight Night 115.
[28] However, Hein pulled out of the fight due to injury on 21 August from the event and replaced by Mike Santiago.
[34] However, Vendramini pulled out of the bout in late April citing a knee injury and subsequent surgery.
[41] A majority of the perpetrators were found to be from North Africa, primarily Morocco and Algeria, with half of the suspects arriving in Germany within the year.
Hein criticized the political and legal system in Germany, feeling it did not do enough to prevent such crimes.