Travis Boys, the man suspected of fatally shooting New Orleans Police Officer Daryle Holloway before leading police on a massive manhunt, has been taken into custody. (Reuters)

After a 24-hour manhunt, New Orleans police on Sunday arrested a man believed to have fatally shot a police officer while wearing handcuffs as he was being transported to jail.

Questions remain about where the gun used to kill Officer Daryle Holloway, 45, came from and how the shooter hid from a law enforcement search that included canine, SWAT and helicopter teams.

Travis Boys, 33, was still wearing broken handcuffs when a rookie officer and his trainer spotted him trying to board a city bus Sunday, Police Superintendent Michael Harrison said.

“To my understanding, he got on the bus after spotting the officers. And the officers saw that and then he got off the bus and then was apprehended,” Harrison told reporters while standing in front of a memorial to the city’s fallen police officers.

Authorities took Boys to a hospital for treatment of apparent dehydration, Harrison said.

Louisiana State Police talk to people on a porch as they search for an escaped prisoner who shot and killed a New Orleans police officer while he was transporting the prisoner on June 20. The prisoner was taken into custody the next day. (Gerald Herbert/AP)

Boys was to be charged with first-degree murder of a police officer, aggravated escape and illegal possession of a firearm, as well as the aggravated battery charge for which he was arrested Friday night, Harrison said.

Harrison said authorities are investigating how the shooter got the gun. The officer’s gun was in his holster and was not used, he said.

Authorities recovered two weapons in the police vehicle — a .38-caliber revolver that had been used in an aggravated battery for which Boys had been arrested and a .40-caliber Smith & Wesson that was used to shoot the officer, Harrison said.

— Associated Press