His death was announced Wednesday on his FB page as well as by his costars from "Texas Flip N Move," the Snow Sisters, who had the same statement. It reads, "We are broken hearted over The Lone Wolf Randy Martin who passed away early this morning. Please pray for his wife and family as they navigate this difficult time. You will be missed."

Donna Snow tells TMZ ... Randy, a longtime friend/associate, died from cancer, and he was at his home when he passed, with his wife, Judy, by his side. We're told Donna visited him recently and he appeared fairly weak and in bad health.

Judy confirms Donna's account, elaborating to us that he had liver cancer and had been diagnosed in May 2022. She notes ... he was beloved by all, even strangers.

RM has been on the show pretty much since the beginning. The series started on the DIY Network in 2014, and he's had appearances on and off since Season 1. The following year, however, Martin was heavily featured as a main cast member ... which continued on through 2017.

It doesn't look like he's been on there much since then ... but he's certainly considered part of the 'TFNM' family. As his nickname indicates, Randy wouldn't hesitate to get things done on his own -- especially when it came to the business of buying and flipping homes.

That's what the show's all about -- with the catch being they can't see the inside of the houses they buy before working on them -- and Randy wasn't afraid to get his hands dirty. He was quite the personality as well, with quick wit and jokes always on hand.

Randy was 65. He leaves behind a spouse, kids and grandchildren.