Sac City, Iowa Police arrest a Florida man for the murder of a S - KTIV News 4 Sioux City IA: News, Weather and Sports

Sac City, Iowa Police arrest a Florida man for the murder of a Sac City resident

Posted:
John David Green, 54, of Florida charged with one count of first degree murder. John David Green, 54, of Florida charged with one count of first degree murder.
Mark Koster Mark Koster
House where Mark Koster was found in November 2012. House where Mark Koster was found in November 2012.
ORANGE PARK, Fla. (KTIV) -

A cold case that Sac City, Iowa, police have been working on for years finally has some answers.

54-year-old John Green is behind bars in Clay County, Florida and has been charged with first degree murder of a Sac City, Iowa man, Mark Koster.

John Green, of Florida, agreed to come in for an interview with Sac City Police and Florida Department of Law Enforcement in Orange Park, Florida.

During the interview, Green claimed responsibility for the death of Koster.

Green was arrested and held.

58-year-old Mark Koster's body was found in the basement of this home back in 2012.

Koster's family believed he left the area in 2009. They reported him missing several months later. And, even before the body was discovered, Koster was declared dead in 2011.

Sac City Police have been working the case for years and Tuesday, they finally found the alleged murderer, John David Green, in Clay County, Florida.

"It was the Chief of Police back in Sac City. They were actually doing a great investigation and coming down here and hunting him. They had some information that led them to believe he was here," Lt. Wayne McKinney, with the Clay County, Florida Sheriff's Department said.

Authorities from Clay County, Florida said Green came up to the Orange Park Dog Track and was staying in a camper there in the parking lot for the past few days. Lieutenant Wayne McKinney of the Clay County, Florida Sheriff's Department said Green agreed to come in for an interview with Sac City Police.

"They're working the Florida Department of Law Enforcement, FDLE, our state agency down here, and FDLE is actually the one that called me up cause where they had located is close to one of our sub-stations, so we set them up with an interview room. We did serve the warrant," McKinney said.

In the interview, Green, claimed responsibility for Koster's death and the concealment of the body.

"We arrested him right here. He never left the office, once they brought him in for an interview," McKinney said.

Green has been charged with one count of 1st degree murder and is awaiting extradition back to Iowa within the next week or so. 

Authorities said Green lived with Koster for a short time in 2009.

Besides, claiming responsibility for his death, there is no more information at this point on Green's motive.



Previous Story: 
ORANGE PARK, Fla. (KTIV) - It's been nearly five years, but a Florida man is now in custody and charged with the murder of a Sac City, Iowa man.

Authorities have arrested and charged 54-year-old John Green of Florida, with first-degree murder.

Police found him in Orange Park, near Jacksonville.

In 2009, the family of 58-year-old Mark Koster, of Sac City, told police they thought he had left the area.

But, after not hearing from him in several months, a missing person report was filed.

The family declared Koster legally dead in 2011.

However, after his home was sold in 2012, his decomposed body was found concealed in the basement.

As part of the investigation, police discovered Green had lived with Koster for a short time in 2009.

Sac City police tracked Green to Florida, where he admitted to the crime.


"It was the Chief of Police back in Sac City. They were actually doing a great investigation and coming down here and hunting him. They had some information that lead them to believe he was here," said Lt. Wayne McKinney, with the Clay County Sheriff's Department in Florida.


During a court hearing Wednesday morning, Green was denied bond and he will not fight extradition.He'll remain in the Clay County, Florida jail until he's returned to Iowa.

Authorities said that could be in the next week or so.

KTIV's Stephanie Ross is following this story and will have more on News 4 starting at 12.


Previous story:
ORANGE PARK, Fla.(SUBMITTED) - Sac City Police Chief John Thomsen said in a news release, they interviewed and arrested John David Green, 54 of Florida for the June 2009 murder of Sac City resident Mark Koster.

In the spring of 2010, a missing persons report was filed with the Sac City Police Department by the family of then 58-year-old Mark Koster.
The family believed that Koster had left the Sac City area for a period of time during the summer of 2009 but became concerned when they had not heard from him after several months.


Mark Koster was declared dead in 2011.


In November 2012, his residence was sold and his decomposed body was found concealed in the basement of that residence.

The on-going investigation into Koster’s disappearance and death led investigators to Green, who had lived with Koster for a short time in 2009.


Green was recently located in the Orlando, Florida area.


Iowa Investigators worked with the Florida Department of Law Enforcement and the Clay County, Florida Sheriff’s Office in locating and interviewing Green.


During the course of the interview, Green claimed responsibility for Koster’s death and the concealment of his body.

John David Green has been charged with one count of 1st degree Murder and is awaiting extradition back to Iowa.

This investigation was a cooperative effort between the Sac City Police Department, the Iowa Division of Criminal Investigation, the Iowa Division of Intelligence, the Florida Department of Law Enforcement, The Georgia Bureau of Investigation, the Clay County, Florida Sheriff’s Office, the Sac County Attorney’s office and the Iowa Attorney General’s office.

KTIV's Stephanie Ross is covering the story. Follow her tweets @Stephanie_KTIV.




 
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