DETROIT (AP) ' A U.S. customs agent fatally shot a 20-year-old Detroit armed robbery suspect in self-defense and will not be charged in the killing, the Wayne County prosecutor said Wednesday.Terrance Kellom's April 27 death came amid a national debate over police conduct ' particularly toward black men. Kellom was black, as is the agent who shot him."Yes, black lives matter," Prosecutor Kym Worthy said at a news conference. "Of course they matter. But you know what else matters' Credible facts matter. ... Doing justice matters and the truth matters."Police say Immigration and Customs Enforcement agent Mitchell Quinn shot Kellom after the suspect lunged at the agent with a hammer during a raid at his father's west side home. His father, Kevin Kellom, has disputed that account.Evidence and witness statements showed Quinn was "justified by the laws of self-defense," Worthy said. She said Kellom was shot four times. He was wanted on armed robbery and weapons charges."It's upsetting ' that's my son," Kevin Kellom said of Worthy's decision. "It hurts.""I was hoping it wouldn't go that way," Kellom said.The shooting was investigated by Michigan State Police. The family's lawyer, Karri Mitchell, dismissed Worthy's decision without an independent investigation.He said the family will file a civil lawsuit.Speaking Wednesday ahead of Worthy's announcement, Quinn's lawyer David Griem said he had reviewed the reports submitted by the other five officers, and that all accounts were consistent."I've been doing this for more than 35 years ' first 10 as a state, then a federal prosecutor," Griem said. "I have prosecuted police officers, defended police officers. If there was ever a case in which the shooting was justified, this was it."Afterward, Griem said his client was prepared for a lawsuit.His client's recommendation is "no settlement" and "the case be tried."Quinn was placed on paid administrative leave after the shooting and has since returned to duty, ICE spokesman Khaalid Walls said in a statement."The officer involved was fully compliant with the independent investigations into the matter," Walls said.Some protests in Detroit followed Kellom's shooting, but they were small and peaceful compared to demonstrations that have taken place elsewhere.Last year, an unarmed black man in New York and an unarmed 18-year-old black male in Ferguson, Missouri, died in separate violent encounters with police ' cases that shined a national spotlight on police treatment of minorities and sparked calls for reforms. Protests and rioting followed Michael Brown's death in Ferguson and a grand jury's refusal to indict the officer. The unrest resumed this month as protesters marked the one-year anniversary of Brown's death.Protests also followed the deaths of two unarmed black men after encounters with police earlier this year in Baltimore and South Carolina. Officers have been charged in both of those cases.Join the conversation about this story Click here to read full news..