A 25-year-old man from McLean, Virginia was killed last month after an officer shot him, and his family said they’re still in the dark about what led to that deadly shooting.

Bijan Ghaisar was fatally shot in the head by a U.S. Park Police officer on Nov. 17, after a brief pursuit on the George Washington Parkway.

Ghaisar’s mom, dad, sister and brother-in-law gathered outside U.S. Park Police District Two Station on Sunday, just off the George Washington Parkway. They held signs and a large, framed photo of Bijan — and were looking for answers.