The sportsman, who was jailed earlier this month for driving under the influence and evading arrest, shot to fame as one of the stars of WWE.
It has been claimed the son of Jerry ‘The King’ Lawler attempted suicide while imprisoned.
According to reports Brain was rushed to hospital on July 29 and pronounced brain dead before passing away in the afternoon.
Brian’s death has shocked the wrestling world with friends and family alike taking to social media to pay their respects.
WWE remembered Brian in a touching tribute shared on their website, which read: “WWE is saddened to learn that Brian Christopher Lawler, who is best known in WWE as Too Cool’s Grandmaster Sexay, has passed away.
“Lawler, who is the son of WWE Hall of Famer Jerry ‘The King’ Lawler, competed during the height of the Attitude Era. WWE extends its condolences to Lawler’s family, friends and fans.”
US Businessman and Republican donor David Herro said: “Hoping my longtime friend Brian Lawler has finally found peace. Thoughts and prayers with his family and most of all his son.”
Professional wrestler Kurt Angle tweeted: ”Sorry to hear the passings of Nikolai Volkoff, Brian Christopher and Brickhouse Brown.
“A very sad day in the history of Sports Entertainment.”
MCW wrote on their official Twitter account: “The entire staff of MCW Pro Wrestling would like to offer its heartfelt condolences to the family and friends of former WWE Star Brian Lawler.”
Retired wrestler Diamond Dallas Page also paid tribute to Brian and fellow wrestlers Nikolai Volkoff and Brickhouse Brown, who passed away on the same day.
He wrote “Today is a super sad day for me and wrestling fans everywhere.
“I just found out Nikolai Volkoff, Brian Lawler and Brickhouse Brown all passed away today.
“It literally took my breath away. My deepest sympathies go out to all their families. God Bless you brothers. Gods Speed DDP.”
Hall of Famer Nikolai, whose portrayal of a Soviet villain made him a favourite amongst famous, died at the age of 70.
He was known for taunting the crowd and wore a scarlet and gold outfit while waving a Soviet flag.
WWE said of him: “As one of the greatest villains sports-entertainment had ever seen, Volkoff’s infamous rendition of the Soviet National Anthem before his matches made him an instant icon in the eyes of the WWE Universe as a Superstar they truly loved to hate.”
Brockhouse Brown died aged 57 after a battle with cancer, he was known for his feud with fellow wrestlers Terry Funk, Scott Steiner and Jerry ‘The King’.
The sports star had worked for multiple promotions in the 80s and 90s, including AWA, USWA and the CWA.
This year Brockhouse was honoured with a Courage Award by the Cauliflower Alley Club.