Civil rights groups and family members of Terence Crutcher, an unarmed black man who was shot and killed by police in Tulsa, Oklahoma on Friday, are demanding justice for the slain father of four.Dashboard and helicopter footage released late Monday shows Crutcher with his hands in the air as four police officers approach him, guns drawn and pointed at him, in the moments before he was shot.Crutcher\u0026#039;s death is the latest fatal shooting of an African-American person by police at a moment when the Movement for Black Lives has created a national debate on police brutality that activists say disproportionately targets black communities.\u0022The murder of Terence Crutcher, an unarmed black man, by a Tulsa police officer is yet another reminder that our nation\u0026#039;s law enforcement departments need radical change,\u0022 said Lecia Brooks, outreach director at the\u0026nbsp;Southern Poverty Law Center. \u0022Today, four children are without a father, a mother without a son, a sister without a brother, and a community wondering how many more black lives will be destroyed before America stands up and says \u0026#039;never again.\u0026#039;\u0022\u0022It\u0026#039;s time for everybody to demand that this stops and that justice is served,\u0022 said Crutcher\u0026#039;s twin sister, who appeared devastated during a press conference on Tuesday:\u0022His life mattered.\u0022 #TerenceCrutcher\u0026#039;s twin sister demands justice: pic.twitter.com/OCRHS6wfYr— Crystal Johnson (@Crystal1Johnson) September 19, 2016Crutcher\u0026#039;s family says his car had broken down in the middle of the road, and that Crutcher had just left the vehicle to seek help when police arrived.\u0022They treated him like a criminal,\u0022 added one of the family\u0026#039;s lawyers, Benjamin Crump. \u0022They treated him like a suspect. They did not treat him like somebody in distress who needed help. Instead of giving him a hand, they gave him bullets.\u0022Video footage of the shooting can be viewed here. (Warning: footage is graphic and may be disturbing.)The 40-year-old husband and father had no criminal record. The U.S. Department of Justice announced Tuesday that it is investigating the shooting.\u0022[The Tulsa police officers\u0026#039;] actions were immoral, reprehensible, and outright criminal.\u0022—Brady Henderson, ACLU of Oklahoma\u0022As the Department of Justice investigates this case, we must confront the racism embedded so deeply in police practices and demand change now,\u0022 Brooks said.\u0022As Terence\u0026#039;s family and community plead for peaceful protests and level heads, today\u0026#039;s promise of an independent federal investigation perhaps will bring some hope for peaceful resolution to a community that has been brutally betrayed by the people sworn to protect it,\u0022 said legal director of the ACLU of Oklahoma Brady Henderson.\u0022If this killing is investigated competently and fairly, I believe we will see murder or manslaughter charges against the shooter, and hopefully accessory charges against the officers who treated Terence Crutcher like a piece of meat rather than a human being. Their actions were immoral, reprehensible, and outright criminal,\u0022 Henderson continued. \u0022Putting Terence\u0026#039;s killer and her companions behind bars won\u0026#039;t bring Terrence back, but it is a necessary part of repairing the broken bond between police and communities of color, a rift that continues to claim lives.\u0022The officer who shot Crutcher, Betsy Shelby, is white. She said she thought Crutcher was behaving as though he was on PCP, and that Crutcher was not cooperating before she fatally shot him. Shelby has been placed on paid administrative leave.The police officers did not offer first aid to Crutcher for over two minutes after he was shot. In the video footage, he is shown lying prone on the street while blood pools around him.