UFC heavyweight star Shane Carwin has announced his retirement from the sport at the age of 38.

“Officially retired 2day:-) thank you to my family, friends and fans! #dreambig GOD BLESS!!!” Carwin announced on Twitter.

While he hasn’t offered up a reason for his decision just yet it has been widely known that Carwin has been dealing with a series of serious injuries that’s kept him out of the Octagon for the past two years.

Back and neck surgeries followed by knee issues have all taken their toll and left him spending the majority of his time in the treatment room rather than the training room.

Carwin’s MMA career comes to a close with a 12-2 record, 4-2 in the UFC. He made the most of his time in the sport’s biggest stage, most notable winning the UFC interim heavyweight title after a KO win over Frank Mir in 2010, while he also came close to claiming the real heavyweight belt against Brock Lesnar later that year and would also go on to coach on a season of ‘The Ultimate Fighter’ reality show opposite Roy Nelson.

While he was perhaps best known for his heavy-handed knockout power and imposing physique, Carwin also stood out for the fact that even at the peak of his UFC career he still maintained a day job as an engineer which he professed a genuine love for, and so it’s likely he’ll continue with that career now that his time in MMA has come to an end.