The Sacramento, California, police officers who fatally shot Stephon Clark have returned to work, as an investigation into the shooting death continues.

After more than one month on administrative leave, the Sacramento police officers who shot and killed Stephon Clark are back at work, KOVR-TV reported Friday.

The officers, who have not been publicly identified, shot Clark after believing he was armed, although Clark only had a cellphone in his possession.

What’s the story?

The Sacramento Police Department would not confirm exactly when the officers went back on duty, but said they are not yet back patrolling the streets due to safety concerns.

Local Black Lives Matter protesters have been calling for the officers to be criminally charged in Clark’s death, but Sacramento County District Attorney Anne Marie Schubert has not given any indication that charges are forthcoming.

She called Clark’s death a “tragedy” but said the police department has not sent her any information about the case for review yet.

“If we believe a crime has been committed — can we prove that case beyond a reasonable doubt?” Schubert asked Wednesday during a news conference.

Schubert said the investigation could take more than a year to be resolved.

What about the protests?

Black Lives Matter has been holding protests outside the district attorney’s office every Tuesday, Wednesday, and Thursday as they push for the officers to be charged.

Why was Clark’s brother arrested?

Stephon Clark’s brother, Stevante Clark, was arrested Thursday, charged with making threats intending to cause death or great bodily injury, and making harassing calls to 911.

Stevante Clark said he regrets how he’s behaved in the weeks since his brother’s death and said he is struggling with mental health issues.

“I hate my life,” Clark said. “Something is very wrong up there. I can admit that, but I’m not out here doing crazy, stupid, belligerent things. I’m trying to take care of my family.”

Clark has been an outspoken protester since Stephon’s death, including a highly publicized city council meeting during which he jumped on a podium in front of the mayor and started a chant of his brother’s name.