Former MLB pitcher Brian Matusz has tragically died at 37 years old.
Matusz's team, the Baltimore Orioles, announced the heartbreaking news late Tuesday evening ... though a cause of death was not revealed.
"Brian's family and loved ones are in our thoughts and prayers at this difficult time," the team wrote.
Matusz -- a former first-round pick -- got his start in the Big Leagues in 2009 ... but he saw his first significant action in 2010, when he threw 175.