The parents of Michael Brown have filed a wrongful-death lawsuit against the city of Ferguson over the fatal shooting of their son by a white police officer, a confrontation that sparked a national protest movement. Attorneys for Brown's parents, Lesley McSpadden and Michael Brown Sr., filed the complaint at the St. Louis County Courthouse on Thursday and called a news conference to announce that the case would bring to light new forensic evidence and raise doubts about the police version of events. The lawsuit is seeking $75,000 in compensation, as well as unspecified punitive damages, and calls for a court order prohibiting the use of police techniques 'that demean, disregard, or underserve its African-American population'. Scroll down for video . Attorney Anthony Gray speaks as Michael Brown's parents, Lesley McSpadden, second from left, and Michael Brown Sr., right, listen along with attorney Benjamin Crump, left, during Thursday's news conference . The family's lawsuit is seeking $75,000 in compensation, as well as unspecified punitive damages, and calls for a court order prohibiting the use of police techniques 'that demean, disregard, or underserve its African-American population' Brown's parents didn't speak, but Lesley McSpadden wore a red hoodie bearing her son's likeness, while Mike Brown Sr. wore a St. Louis Cardinals snapback and a hoodie that said, 'Mike Brown chosen for change'. The new lawsuit alleges that Officer Darren Wilson destroyed evidence after he shot Brown on the street of the St. Louis suburb last August, saying he washed blood off his hands and cleared and bagged the gun used in the shooting. 'We expect to put on evidence that you never heard about before, that you have never seen,' Anthony Gray, one of the lawyers for Brown's family, said at Thursday's news conference. The civil suit claims Brown had his hands up in surrender when he was killed, a claim strongly disputed during the previous investigation. Gray said evidence had not been presented properly in the previous investigations and he criticized the prosecutor who had presented the case to a grand jury. 'The evidence has not changed, but the presentation of that evidence will,' he said of the civil lawsuit. The civil lawsuit names the city of Ferguson, former Police Chief Thomas Jackson and former police officer Darren Wilson as defendants. 'We expect to put on evidence that you never heard about before, that you have never seen,' said Anthony Gray, left, during Thursday's press conference . Wilson 'unjustifiably shot and killed (Brown), using an unnecessary and unreasonable amount (of) force in violation of (Brown's) constitutionally guaranteed right to life,' the lawsuit states. Jackson, who resigned last month, is included because he 'maintained general supervision' of Wilson and 'was also responsible for his hiring, training and retention,' the lawsuit states. If it comes to trial, the lawsuit could force a full review of all the evidence in the shooting and bring key witnesses to be questioned in open court, including Wilson. Attorney Benjamin Crump told reporters that the alleged subterfuge with which investigators handled the Wilson probe is indicative of a national trend. He cited the cases of Eric Garner, Floyd Dent, Tamir Riceand Antonio Zambrano-Montes. 'The narrative of the law enforcement all across the country for shooting unarmed people of color is the same: That they had no other choice,'  Crump said. 'But time and time again, the objective evidence contradicts the standard police narrative.' The lawsuit also lists incidents of alleged unlawful stops and arrests of African-Americans in Ferguson. It asks for the court to assign a monitor to the city's police force for five years or until 'the city of Ferguson has fully and effectually trained all of its police officers on the constitutional requirements of the use of deadly force.' Lesley McSpadden, the mother of Michael Brown, wore a sweatshirt remembering her son during Thursday's new conference, left, while Michael Brown Sr., the father of Michael Brown, as also in attendance . Brown, 18, was unarmed and walking in the street with a friend on August 9 when Wilson told them to move to the sidewalk. That led to a heated confrontation and a scuffle between Wilson and Brown inside Wilson's squad car. Wilson shot Brown after the scuffle spilled into the street. Some witnesses said Brown was trying to surrender, but Wilson said Brown was moving toward him aggressively, forcing him to shoot. Brown's shooting led to sometimes-violent protests and spawned a national Black Lives Matter movement calling for changes in how police deal with minorities. In the end, local and federal authorities ruled that the shooting was justified. A St. Louis County grand jury and the U.S. Justice Department declined to prosecute Wilson, who resigned in November. But the Justice Department released a scathing report citing racial bias and profiling in the Ferguson Police Department and a profit-driven municipal court system that frequently targets black residents. Several city officials resigned following the review, including the city manager, police chief and municipal judge. The municipal court clerk was fired for racist emails. Brown was unarmed when he was fatally shot by a white police officer, Darren Wilson, in a St. Louis suburb in August 2014. Wilson resigned in November . Civil cases generally require a lower standard of proof than criminal cases. Jurors must find a preponderance of evidence, not proof beyond a reasonable doubt needed to convict in a criminal trial. Two decades ago, football star O.J. Simpson was acquitted of the killings of his ex-wife, Nicole Brown Simpson, and her friend, Ronald Goldman. But a civil jury awarded the Brown and Goldman families $33.5 million in wrongful-death damages. The family of Amadou Diallo, an unarmed man killed by police in 1999, settled with New York City for $3 million in 2004 after filing a $60 million lawsuit. The city did not admit any wrongdoing. The settlement came after four officers indicted in his shooting were acquitted of second-degree murder and reckless endangerment. Wrongful-death lawsuits have been filed in other recent high-profile cases, too. In New York, the family of Eric Garner is seeking $75 million in damages. Garner, who was black and had asthma, died in July after a white plainclothes officer applied what a medical examiner determined was a chokehold after Garner was accused of selling loose, untaxed cigarettes on a city street. Brown's shooting led to sometimes-violent protests and spawned a national 'Black Lives Matter' movement calling for changes in how police deal with minorities .
Attorneys for Lesley McSpadden and Michael Brown Sr., filed the complaint at the St. Louis County Courthouse on Thursday .
Lawsuit alleges that Officer Darren Wilson destroyed evidence after he shot their son on the street of the St. Louis suburb last August .
Civil suit claims Brown did have his hands up in surrender when he was killed - a claim strongly disputed during last year's investigation .
They are seeking $75,000 in compensation, as well as unspecified punitive damages .
Also called for a court order prohibiting the use of police techniques 'that demean, disregard, or underserve its African-American population'