Oweh, 27, spent the first five-and-a-half years of his career with the Baltimore Ravens before the team traded him to the Los Angeles Chargers in 2025. He didn't record a single sack last season before the Ravens traded him.
That all changed with the Chargers, where he recorded 7.5 sacks in 12 games. Oweh led the Charges in total quarterback pressures (37) in those 12 games.
He'll be joining a Commanders team that finished last season with a 5-12 record and ranked 12th with 42 team sacks.
The Commanders also signed cornerback Amik Robertson to a two-year, $16 million deal with $9.3 million guaranteed.
Robertson, 27, recorded 52 tackles, 12 pass deflections, two forced fumbles, and one interception in a full season with the Detroit Lions. He committed three penalties all season and finished with an opposing passer rating of 110.5 - the highest it's been in the past five years.
Robertson also gave up a career-high six passing touchdowns in 2025.