A manhunt is underway for a suspect in a 2021 killing who was accidentally released from a detention center in Indianapolis last week, a sheriff's office said Tuesday, asking for the public's help finding him.

Kevin Mason, 28, was "mistakenly released" from an adult detention center in Marion County on September 13, two days after his arrest, "due to a faulty records review" by staff, the Marion County Sheriff's Office said in a news release.

It's unclear whether he's still in the county, sheriff's Col. James Martin said in a news conference Tuesday.

Mason was arrested in Indiana on September 11, having been sought on three Minnesota warrants, including one asking he be held on suspicion of murder in connection with a 2021 shooting in Minneapolis, the sheriff's office said. The other warrants relate to an alleged parole violation and firearms possession, Martin said.

He was released after a Marion County sheriff's clerk thought she was correcting duplicate bookings for the inmate and removed two holds in his file, Martin said. The next day, a clerk in Minnesota lifted the final hold in Mason's file and did not catch the error that happened the day before, according to the colonel.

Two inmate records clerks involved in Martin's release have been fired, and an internal investigation is being conducted, according to Martin.

"This was an error -- this should not have happened. Mason should not have been released from our custody," Martin said.

Officials discovered the error "shortly after" Mason's release and a "round-the-clock" manhunt has been underway ever since, Martin said.

The search comes on the heels of a massive manhunt that captured national attention in Pennsylvania. Convicted killer Danilo Cavalcante escaped from a Pennsylvania county jail by "crab-walking" up to the roof on August 31 and managed to evade hundreds of officers searching for him for nearly two weeks before he was recaptured in the woods.

The US Marshals Service, which was involved in the search for Cavalcante, is now helping with the search for Mason, authorities said.

The sheriff's office waited six days to alert the public of Mason's accidental release because it wanted to maintain a "tactical advantage," Martin told reporters.

"We have used this time as the quietness of the situation to not further run him underground and send him running further than what we wanted him to," Martin said.

Mason has "local ties to Indianapolis" and had been in the area since the killing he is accused of in Minnesota, Martin said.

Investigators are concerned Mason may have left the area since leaving custody, and that someone may be helping him, the colonel said.

"He has obviously evaded law enforcement since 2021. We believe that he is pretty good at what he does," Martin said.

The sheriff's office asked the public to come forward with any information on Mason's whereabouts.

Mason is described as weighing 205 pounds and standing about 5'9" tall, with a cross tattoo under his right eye and a tattoo reading "SUB" on his chest.

"We do not have any information that leads us to believe that the public is in any immediate danger at this time," Martin said, but told members of the public to "not approach Mr. Mason in any form or fashion."