Dre Greenlaw was suspended 1 game by the NFL for headbutting Seahawks linebacker Ernest Jones IV after a sideline confrontation in Week 5 (from the Dre Greenlaw page). He intends to appeal the suspension.
It's also worth noting that this is part of a broader disciplinary pattern — Greenlaw has had multiple ejections and fines this season, including a headbutt ejection on Chargers QB Justin Herbert and a taunting fine. The wiki also flags that the NFL's new three-strike suspension rule adds potential risk for aggressive defenders like him going forward.