Tonight's episodes dealt with the aftermath of the dramatic rescue by the off-duty Station 19 team of two Black teenage girls who had been kidnapped and Robert and Dean's arrest by an overzealous white cop. ... Eventually, Opal was arrested but not before her accomplice stabbed DeLuca.

Who stabbed DeLuca?

In the Season 17 episode, "Helplessly Hoping," Andrew dies after being stabbed by an accomplice of Opal, a human trafficker whom Andrew had recognized previously.

How was DeLuca killed?

Deluca was killed in season 17 when he was stabbed as he continued to investigate this human trafficking case, and he died at Grey Sloan Hospital.