A Baltimore detective was fatally shot with his own gun just one day before he was set to testify before a federal grand jury in a case involving other officers, the city’s police commissioner said Wednesday.

“Detective Suiter was going to offer federal grand jury testimony about an incident that occurred several years ago that included officers who are now federally indicted back in March,” Police Commissioner Kevin Davis said of Sean Suiter.

“He was scheduled to offer grand jury testimony the day after he was murdered,” he added.

But Davis stressed that as the search for Suiter’s killer continues, there was currently no evidence that the slaying was linked to his upcoming testimony or any conspiracy.