On Monday, the 41-year-old father's passion for football cost him his life.
Prosecutors announced Tuesday they are charging three players, two 15-year-olds and a 16-year-old, with manslaughter, assault and public violence for alleged involvement in a vicious attack on Nieuwenhuizen after a youth match between two local clubs, Buitenboys and Nieuw Sloten. The players, whose identities have not been released, will be arraigned Thursday at a closed-door hearing.
Prosecutors have released no details of a possible motive and Buitenboys club chairman Marcel Oost said the reason for the attack was not certain.
"We still don't have a clear picture yet," prosecution spokeswoman Brigit Haan told The Associated Press.
The deadly assault sent shock waves through the football-mad Netherlands, with the sports minister, football association and coach of the country's most storied club, Ajax, expressing disbelief and discontent.
The Royal Netherlands Football Association on Tuesday said it was cancelling all amateur football matches for the coming weekend as a mark of respect for Nieuwenhuizen. Professional matches will go ahead, but players and officials will wear black armbands and observe a minute's silence before kickoff.
The association said about 33,000 matches were planned for the weekend, national broadcaster NOS reported.
The attack hit at one of the foundations of Dutch youth sport — the participation of parents.
"It is unbelievable that something like this could happen on a football pitch," said Bert van Oostveen, the association's director of professional football. "These are the volunteers on which our sport is built, without them we cannot go on."
On any given weekend, at thousands of sports grounds across the Netherlands, parents are the engine that powers youth sport. They volunteer for everything from brewing tea to marking out lines on fields and wielding whistles and flags as referees and linesmen.
In the overwhelming majority of matches, players and parents enjoy the sport and then have a drink together in the clubhouse.
But sometimes frustrations boil over into violence after the final whistle.
Amsterdam alderman Eric van der Burg, whose portfolio in the city covers sports, said the team from Nieuw Sloten had been in trouble twice before, once for verbally abusing a referee and once when a player got into a fight with a spectator. The player involved in the fight was suspended by the club, Van der Burg told the AP in an email.
Calls to Nieuw Sloten seeking comment went unanswered. The club issued a statement Monday night expressing its horror at Nieuwenhuizen's death and pledging full co-operation in the investigation.
Van der Burg said the city already has an agreement from four-time European champion Ajax at the top all the way down to small local clubs to prevent aggression on and around fields.
"It's important that parents but also the professional players give good examples how to behave," he said. "Sports should be fun."
Even FIFA President Sepp Blatter weighed in on the national debate about how such an attack could happen.
"Football is a mirror of society and sadly, the same ills that afflict society — in this case violence — also manifest themselves in our game," Blatter said Tuesday in a statement. "Nevertheless, I remain convinced that football — through the example set by the tireless efforts of people like Mr. Nieuwenhuizen — is a force for good, and we must continue to use its positive example to educate people against these wrongs."
Prosecutors say a group of Nieuw Sloten players surrounded Nieuwenhuizen after the match Sunday, kicking and punching him.
Nieuwenhuizen initially appeared to have recovered from the assault at the club whose fields are squeezed into an industrial neighbourhood of Almere, a fast-growing commuter city just outside Amsterdam. He went home and lay down, but returned later to watch another game. It was then that he collapsed and was rushed to the hospital.
A day later, with his family surrounding his hospital bed, he died.
A few hours later, decorations marking Wednesday's St. Nicholas day — a national celebration similar to Christmas — were still hanging at the Buitenboys clubhouse as team members wept and consoled one another.
Nieuw Sloten immediately banned the players involved and scrapped their team from the league as well as cancelling all matches for the coming weekend.
As a wave of grief swept over the football community, another Amsterdam club, TOS-Actief, said on its website it was cancelling all matches for the weekend.
"By doing this, TOS-Actief is taking a clear stance against excesses in football," the club said. "We say stop violence on and around the pitch."
Van der Burg proposed cancelling all amateur matches nationwide for the coming weekend.
A delegation from the Royal Netherlands Football Association visited Buitenboys on Tuesday to discuss "a fitting way to pay tribute" to Nieuwenhuizen and express support for the club.
Nieuwenhuizen's death came almost exactly a year after a Dutch amateur footballer fatally kicked a 77-year-old supporter following a match.
Amsterdam District Court last week sentenced the player, identified only as Silvester M. in line with Dutch privacy law, to three years imprisonment for kicking the supporter so hard in the chest that his spleen ruptured. He died of his injuries a month later.