Transcript for Family of Navy vet who died in police custody speaks out
We're going to turn next here to the family of a 30-year-old Navy veteran tonight, claiming their loved one died after a police officer put his knee to his neck for several minutes. The D.A. Is now investigating and here's kayna Whitworth. Reporter: Tonight, the family of a 30-year-old Navy veteran who died after police restrained him is speaking out, alleging a police officer put a knee on his neck until he lost consciousness and died three days later. It didn't make sense to use that level of force and restraint on somebody who was not violent. What happened? Reporter: Newly released video showing the aftermath of the disturbing incident. Angelo Quinto on the ground. You can hear his mother's panic. Cassandra quinta-collins says her son, who suffers from depression, was having a mental health crisis when they called police on December 23rd for help. She says when police arrived Quinto was calm, alleging that police then grabbed him and threw him to the ground. The George Floyd hold was placed on the back of his neck. Reporter: ABC news has reached out to the Antioch police department for comment and hasn't heard back. The district attorney and sheriff's office are investigating the case. David, the family telling me they trusted the police. Now, they're filing a wrongful death lawsuit against the department and they're having an independent autopsy done, because David, authorities still have not released the cause of death in this case. Kayna Whitworth tonight. Kayna, thank you.
This transcript has been automatically generated and may not be 100% accurate.