Parra tested positive for the performance-enhancing substance Boldenone, and his suspension will be effective at the start of next season.
Originally a 47th-round pick by the Reds in 2006 First-Year Player Draft, Parra played 12 games for the rookie Gulf Coast League Orioles this summer. While there, the 21-year-old from Connors State College in Oklahoma hit .324 with a .405 on-base percentage.
Alden Gonzalez is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.