Antwaine Richardson, who started 10 games at safety last year for Maryland football, tore his ACL at practice Saturday and will likely miss the 2019 season, a team spokesperson announced Tuesday.

Richardson figured to be one of the key returning starters to a defense undergoing immense turnover this offseason. Six starters departed, and Richardson’s injury sidelines one of the top pieces in what appears to be an inexperienced — albeit talented — defense moving forward.

The Delray Beach, Florida, native tallied 41 tackles and one interception in 12 games last season. Richardson still holds onto his redshirt, likely enabling him to return for another year.

[Read more: When NFL teams interview Maryland football prospects, they’re asking about Jordan McNair]

Safety Darnell Savage and cornerback RaVon Davis both graduated from the secondary, with the former’s draft stock rising after an impressive NFL Combine performance. Savage intercepted four passes and Davis picked off three in 2018.

Linebacker Tre Watson — finishing with a team-high 114 tackles and five interceptions — also departs, while defensive linemen Byron Cowart, Jesse Aniebonam and Mbi Tanyi are draft hopefuls, too.

Richardson’s injury seems to open room for redshirt sophomore Deon Jones — who appeared in 11 games last season, totaling 17 tackles and forcing a fumble — as well as incoming four-star recruit Nick Cross from DeMatha.