A white Kansas police detective accused of sexually assaulting Black women and girls — and terrorizing those who tried to fight back — is dead, prosecutors said as his trial was set to begin Monday.

Prosecutors say female residents of poor neighborhoods in Kansas City, Kansas, feared that if they crossed paths with Roger Golubski, he’d demand sexual favors and threaten to harm or jail their relatives.

Golubski, 71, was facing six felony counts of violating women’s civil rights. But he did not appear in court Monday morning for the start of jury selection. Prosecutors later confirmed in court that Golubski has died. They did not say how or when he died.