Williams had already been tased when he told officers he had heart problems. Officers subsequently again deployed stun guns and Williams died about an hour later.
[Ads /]
Six officers are on administrative leave and footage from the incident has been released.
"Yet again, we see a life lost too soon due to excessive and unreasonable police force," Crump said. "To continue to deploy a Taser on someone who discloses a heart condition and begs for mercy reflects an immense amount of apathy and blatant disregard for life, as we saw in the video footage.
[Ads /]
"We have seen too many people lose their lives to police tasers and stun guns unnecessarily," Crump added. "Just because they don't shoot bullets does not mean they are not a deadly weapon. We lift up Darryl's family in prayer and fully intend to get them the answers and justice they deserve."
WATCH: What is Raleigh Police Department's Proactive Patrol and is it effective?
What is Raleigh Police Department's Proactive Patrol and is it effective?
VIDEO: Surveillance from night Darryl Williams died in police custody
VIDEO: Surveillance from night Darryl Williams died in police custody