“It is the policy of the Midlothian Police Department to utilize the Illinois State Police Public Integrity Task Force for any officer-involved shootings so we can ensure transparency and maintain public trust,” Midlothian police said, according to the newspaper.

As that investigation continues, some have questions about whether this could have been prevented.

Walter Turner, a pastor at New Spiritual Light Baptist Church in Chicago, said he shared a good relationship with Roberson, who played the organ at his church, according to WLS. He expressed confusion at 26-year-old’s sudden killing.

“How in the world does the security guard get shot by police?” Turner said, according to WLS. “A young man that was literally doing his job and now he’s gone.”

In 2012, 31 percent of the people killed by police officers in the U.S. were black — even though they make up just 13 percent of the overall population, according to an analysis of FBI data from Vox.