Livestream: Prosecutor expected to dismiss charges against man accuse of killing WSU Officer Collin Rose Posted by Gus Burns on Wednesday, December 7, 2016

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DETROIT -- Charges against a man accused of killing Wayne State University police officer Collin Rose, who was shot Nov. 22, have been dismissed for lack of evidence.

Wayne County Prosecutor Kym Worthy, with Detroit Police Chief James Craig and Wayne State Police Chief Anthony Holt, on Wednesday announced DeAngelo Davis, 31, is no longer a suspect in the killing of Rose, a 29-year-old Wayne State police officer.

"All murder charges against DeAngelo Davis will be dismissed today," Worthy said. "He is no longer a suspect at this time."

Davis remained jailed Wednesday morning. It's not clear when authorities realized Davis wasn't the likely killer.

The prosecutor, who called the press conference late Tuesday afternoon, declined to take questions or provide further details, stating she didn't want to compromise the ongoing investigation.

Craig said his detectives have been working "literally around the clock" and the investigation didn't end with Davis' arrest. He remains "optimistic" the killer will soon be arrested.

Police arrested Davis hours after the officer was shot following a massive manhunt involving helicopters and several police agencies. Police initially said Davis was suspected of shooting Rose in the head after the officer attempted to stop and question Davis, who was believed to have been riding his bicycle near the Wayne State University campus in an area that had seen an uptick in larcenies.

Rose died the following day.

There is a $15,000 reward, $5,000 from the ATF, $5,000 from Detroit Dog Rescue and $5,000 posted by Crime Stoppers, for information leading to the arrest and conviction of a suspect.

Tips may provided to 1-888-ATF-TIPS; or CrimeStoppers, 1-888-283-8477.