(Reuters) - A man charged in the shooting of two Detroit police officers earlier this week has been linked through DNA evidence to the fatal shooting of a university police officer last year, authorities said.

Raymond Durham, 60, who was charged in shootings of two Detroit officers on Wednesday, is now the “prime suspect” in the November shooting death of Wayne State University Police Sergeant Collin Rose, Detroit Police Chief James Craig told the media on Friday.

Craig declined to provide details on the DNA evidence that links Durham to Rose’s death, citing the ongoing investigation.

Durham was charged by the Wayne County Prosecutor on Friday in connection with the shootings of the two Detroit officers, the Detroit Free Press reported.

He was arraigned while in hospital, where he is receiving treatment after being shot in the leg during a shoot-out with officers.

One officer was shot once in the ankle and twice in the upper torso, but was wearing protective body armor that likely saved his life. The other officer was shot in the neck, police said. They are both recovering in hospital, the Detroit Free Press reported.

The shoot-out occurred while officers were investigating drug activity on the city’s West Side, just blocks from where Rose, 29, was shot on Nov. 22. He died a day later.

Police are compiling evidence to present to prosecutors regarding Rose’s killing, Craig said on Friday. He said he anticipated charges would be filed against Durham for that shooting.