National Transportation Safety Board Chair Jennifer Homendy will testify at a March 27 Senate Commerce hearing on the mid-air collision of an Army Black Hawk helicopter and American Airlines regional jet that killed 67 people,

It’s been more than a month since an American Airlines plane and a U.S. Black Hawk helicopter collided and plunged into the Potomac River, killing 67 people. On Tuesday, the National Transportation Safety Board (NTSB) will hold a media briefing to share the latest details of their investigation.

The NTSB issued its preliminary report on the midair collision between a passenger plane and helicopter over Washington, D.C., in January.