Country singer Hank Williams Jr.’s wife Mary Jane Thomas’ cause of death has been revealed, four months after her demise. 

Mary, 58, died on March 22 from a collapsed lung, a day after she went under the knife. The Palm Beach County Medical Examiner has classified her death as accidental, saying that she suffered a fatal injury during the cosmetic procedure, TMZ reported. 

The cause of death has been as “pneumothorax due to perforated parietal pleura during liposuction with autologous fat reinjection procedure,” PEOPLE reported. 

The former model lived in Nashville. She had traveled to Bafitis Plastic Surgery in Jupiter, Florida, to undergo the procedure, as well as to get rid of previous breast implants.

The Medical Examiner’s report states that she was cleared for the procedures by a physician at home.

After being released from the facility around 7 pm on March 21, Mary was taken to a recovery facility where she was “sitting up in bed, speaking normally”, the report stated. The following day, she “suddenly” became unresponsive and was rushed to a local hospital where she died. 

Thomas’ surgeon told the authorities that her vitals were normal, and she was given Lovenox, an anticoagulant.

Mary and the musician met in 1985 at one of his concerts. They tied the knot five years later. They shared daughter Katherine, who passed away in a car crash in 2020, and son Samuel, who is a musician.  

“My dear Mama Mary Jane was a beautiful soul who forever affected everyone who knew her. She had a smile and presence that lit up every room and she never met a stranger she didn’t befriend. Her spirit was gentle and giving. She could take down a ten-point buck and fix dinner for her grandchildren at the same time! Now she gets to radiate from above with my sister Katherine Diana right by her side,” Samuel wrote while paying tribute to his mother.