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Man convicted last year of killing 2 in 1976 dies in prison

June 23, 2022 GMT
FILE - In this booking photo, provided by the Marinette County Jail on March 22, 2019, shows Raymand Vannieuwenhoven. Vannieuwenhoven serving two life terms for killing a Wisconsin couple in a slaying that went unsolved for decades has died in prison, state corrections officials confirmed, Thursday, June 23, 2022. Vannieuwenhoven, 85, was convicted last year of fatally shooting 25-year-old David Schuldes and 24-year-old Ellen Matheys in a Marinette County park on July 9, 1976 in Silver Cliff, about 200 miles north of Milwaukee.(Marinette County Jail via AP, File)
FILE - In this booking photo, provided by the Marinette County Jail on March 22, 2019, shows Raymand Vannieuwenhoven. Vannieuwenhoven serving two life terms for killing a Wisconsin couple in a slaying that went unsolved for decades has died in prison, state corrections officials confirmed, Thursday, June 23, 2022. Vannieuwenhoven, 85, was convicted last year of fatally shooting 25-year-old David Schuldes and 24-year-old Ellen Matheys in a Marinette County park on July 9, 1976 in Silver Cliff, about 200 miles north of Milwaukee.(Marinette County Jail via AP, File)
FILE - In this booking photo, provided by the Marinette County Jail on March 22, 2019, shows Raymand Vannieuwenhoven. Vannieuwenhoven serving two life terms for killing a Wisconsin couple in a slaying that went unsolved for decades has died in prison, state corrections officials confirmed, Thursday, June 23, 2022. Vannieuwenhoven, 85, was convicted last year of fatally shooting 25-year-old David Schuldes and 24-year-old Ellen Matheys in a Marinette County park on July 9, 1976 in Silver Cliff, about 200 miles north of Milwaukee.(Marinette County Jail via AP, File)
FILE - In this booking photo, provided by the Marinette County Jail on March 22, 2019, shows Raymand Vannieuwenhoven. Vannieuwenhoven serving two life terms for killing a Wisconsin couple in a slaying that went unsolved for decades has died in prison, state corrections officials confirmed, Thursday, June 23, 2022. Vannieuwenhoven, 85, was convicted last year of fatally shooting 25-year-old David Schuldes and 24-year-old Ellen Matheys in a Marinette County park on July 9, 1976 in Silver Cliff, about 200 miles north of Milwaukee.(Marinette County Jail via AP, File)
FILE - In this booking photo, provided by the Marinette County Jail on March 22, 2019, shows Raymand Vannieuwenhoven. Vannieuwenhoven serving two life terms for killing a Wisconsin couple in a slaying that went unsolved for decades has died in prison, state corrections officials confirmed, Thursday, June 23, 2022. Vannieuwenhoven, 85, was convicted last year of fatally shooting 25-year-old David Schuldes and 24-year-old Ellen Matheys in a Marinette County park on July 9, 1976 in Silver Cliff, about 200 miles north of Milwaukee.(Marinette County Jail via AP, File)

OSHKOSH, Wis. (AP) — A man serving two life terms for killing a Wisconsin couple in a slaying that went unsolved for decades has died in prison, state corrections officials confirmed.

Raymand Vannieuwenhoven, 85, was convicted last year of fatally shooting 25-year-old David Schuldes and 24-year-old Ellen Matheys in a Marinette County park on July 9, 1976, in Silver Cliff, about 200 miles (320 kilometers) north of Milwaukee.

For decades, the widower and father of five children lived quietly among the 800 residents of Lakewood, a northeastern Wisconsin town surrounded by forests and small lakes.

After the slayings went unsolved for more than 40 years, cold case investigators determined in 2019 that a DNA sample taken from evidence at the crime scene came the Vannieuwenhoven family. A DNA sample from Vannieuwenhoven himself — obtained from a licked envelope for a survey on police performance that he filled out — matched the sample from the scene, according to the criminal complaint.

Vannieuwenhoven was charged with two counts of first-degree murder and one count of first-degree sexual assault. The sexual assault charge involving Matheys was dismissed because the statute of limitations had expired.

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Online court records updated Wednesday listed Vannieuwenhoven as deceased. The Wisconsin Department of Corrections said Vannieuwenhoven died June 17 at the Oshkosh Correctional Institution, WLUK-TV reported.

Vannieuwenhoven had denied involvement in the slayings and was appealing the conviction.

In March of 2020, a judge ruled that Vannieuwenhoven did not understand the proceedings and could not assist in his own defense. The judge ordered him to undergo inpatient treatment at Mendota Mental Health Institute in Madison. By that November the judge determined Vannieuwenhoven was able to understand the court proceedings and assist in his own defense and the case moved to trial.