Authorities release new details of Sac City, IA killing - KTIV News 4 Sioux City IA: News, Weather and Sports

Authorities release new details of Sac City, IA killing

Posted:
Law Enforcement at the News Conference in Sac City, Iowa. Law Enforcement at the News Conference in Sac City, Iowa.
Mark Koster Mark Koster
SAC CITY, Iowa (KTIV) - A press conference Tuesday reveals more behind last week's arrest of a man in Orange Park, Florida, in connection with a cold case murder that happened in Sac City, Iowa in 2009.

The situation has been developing since last week, but authorities on the case released more details on the Sac City Police Department and Iowa Division of Criminal Investigation's work to locate the suspect, John Green, and obtain his willing confession.

Mark Koster was reported missing in 2009 by his family, and pronounced legally dead two years later.

"This probably was one of the more, better-worked missing persons cases. Especially considering the fact that Mark Koster did have, from what we were told, a propensity to just pick up and leave," Ben Smith, Sac County Attorney said.

During a 2012 remodel of the home at 610 North 5th Street in Sac City, Iowa, Koster's remains were found in a basement wall.

Authorities say it was several months before they identified Koster's former roommate, John Green, as a suspect in the case, and began collecting evidence.

"The Sac City Police Department and the Division of Criminal Investigation worked it diligently, collecting DNA evidence, executing a search warrant. In the end, it was good. It was good evidence to have," Smith said.

After interviews with family and friends, authorities from Sac City and the Iowa Division of Criminal Investigation began tracking Green, using the assistance of law enforcement agencies in four states across the country.

"Finding John Green wasn't as important as collecting all the evidence and making sure all the 'i's were dotted, 't's were crossed before law enforcement went down and confronted him with what they had," Smith said.

Authorities say they located Green at a casino in Orange Park, Florida. They say they simply asked Green to come in last week and answer a few questions.

That's when Green admitted to choking Koster to death with a baseball bat after a fight, hiding his body in the basement and cleaning the crime scene, then skipping town a few days later.

"Along with current technology, it was good old fashioned police work by the Sac City Police Department, and the DCI, and our division of intelligence as well," Mitch Mortvedt, Iowa DCI said.

Authorities say that while their work can never undo what happened in this home all those years ago, at least at the end of it all, there's some closure waiting for Mark Koster's family.

"What I can tell you is that law enforcement never gave up, and probably the most important thing is that the family now has closure," Smith said.

Closure that, hopefully, will heal the wounds created by unanswered questions for so many years.

John Green was extradited from the Clay County jail in Florida to Sac County's jail late Friday night, and had his initial appearance before a judge on Saturday morning.



Previous Story:


SAC CITY, Iowa (KTIV) - More information is released during a news conference on the 2009 cold case murder of Mark Koster in Sac City, Iowa and the arrest of John Green, the suspect found in Orange Park, Florida.

Authorities from Sac City and the Iowa Division of Criminal Investigation can't say much, because they're concerned about giving John Green a fair trial.They did say their investigation into Green spanned four states and used information from police departments across the country.

In an interview conducted by police in Clay County, Florida, John Green admitted to killing Mark Koster in 2009, while the two were temporarily living together.In the interview, Green admitted killing Koster, dragging his body to the basement, cleaning the home and writing a note to make it seem like Koster had simply left town for awhile.

Koster was reported missing in 2010 and pronounced legally dead in 2011 but during a 2012 remodel of the home, his badly decomposed remains were found in the basement.

Authorities say that locating John Green in Orange Park, Florida was quote "good old fashioned police work and the use of modern technology."

They say the most important thing now is that the family has closure because their search for Mark Koster was extensive.

"This probably was one of the more, better-worked missing persons cases. Especially considering the fact that Mark Koster did have, from what we were told, a propensity to just pick up and leave," Ben Smith, Sac County Attorney said.

John Green was extradited from Florida to the Sac County jail late Friday night.

He had his initial court appearance on Saturday.

Authorities say he came very quietly and hasn't fought a single process by the legal system so far.

Powered by WorldNow
All content © Copyright 2000 - 2014 WorldNow and KTIV Television Inc. All Rights Reserved.
For more information on this site, please read our Privacy Policy, Terms of Service and Mobile Privacy Policy & Terms of Service.

Persons with disabilities who need assistance with issues relating to the content of this station's public inspection file should contact Administrative Assistant Kathy Clayton at (712) 239-4100 x209. Questions or concerns relating to the accessibility of the FCC's online public file system should be directed to the FCC at 888-225-5322, at 888-835-5322 (TTY) or at fccinfo@fcc.gov.