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ATLANTA, Ga. — Former MLB pitcher Tommy Hanson died after slipping into a coma Monday night.

CBSSports.com’s Jon Heyman reports the cause of the 29-year-old’s death and coma are not known at this time.

A representative with the Braves told the MLB some of Hanson’s former teammates were with him when he passed away in Atlanta.

Hanson last pitched in MLB in 2013. He went 21-15 with a 3.16 ERA (126 ERA+) for the Braves from 2009-10 before dealing with numerous arm injuries. Hanson went 28-20 with a 4.36 ERA (89 ERA+) from 2011-13.

While with the Angels in 2013, Hanson spent three weeks away from the team following the death of his stepbrother. Hanson was two years older than his stepbrother, who died at age 24.

Hanson bounced around the minors the last two seasons with the Rangers, White Sox, and Giants in the past two seasons, but never showed enough promise to resume a major league career, Deadspin reports.