Loek van Mil, one of the tallest professional baseball players of all time, died at 34 on Sunday due to what was called a “fatal accident” by the the Royal Dutch Baseball and Softball Association.

Last December, the 7-foot-1 van Mil went to a hospital in Australia in “critical but stable condition” with serious head injuries he sustained while hiking. He was unconscious for 24 hours after hitting his head, suffering a litany of injuries including fractures, hemorrhages and a brain bleed, according to MLB.com.

It’s unclear whether his death was related to that incident, as details have been withheld at the request of the family, though van Mil returned from the injury to pitch in the Australian league’s playoffs.

Van Mil, who retired from baseball just a week ago, spent parts of his 10 minor league seasons in the Twins, Angels, Indians and Reds organizations during his career. Used mostly as a reliever, he ended his time in the minors with a 12-27 record, a 3.48 ERA and 278 strikeouts in 393 2/3 innings.

He never made the majors, going overseas after the 2013 season and returning to the Twins in 2015 before a stint in Australia’s professional league. He also pitched for the Netherlands in the 2013 and ’17 World Baseball Classic. Van Mil spent part of five seasons playing overseas.

Former Diamondbacks prospect Ryan Doherty is also 7-foot-1.