His death was ruled a homicide by the state attorney general.
Margaret Moore, district attorney for Travis County, said her office is still investigating the death – a process that has dragged on for an excruciating 15 months.
Moore said she would be presenting Ambler’s case to a grand jury and that officials in the Williamson County Sheriff's Office haven’t cooperated with her investigation, which is why bodycam footage is only being released now.
"This case has been so unusual. It is not typical for us to encounter obstacles to getting evidence, especially from another law enforcement agency," Moore told CNN.
During the course of the investigation it also emerged that Ambler’s death was filmed by a TV crew who were recording footage for a cop show, A&E’s Live PD.
The show has been cancelled after producers admitted they filmed – and allegedly destroyed – footage of Ambler’s death.
The recording could have been key evidence for investigators.
There are now calls for the Williamson County Sheriff, Robert Chody, to resign.
“I have no confidence that he has the temperament, operational intelligence, administrative ability nor the people skills to handle the job,” said Commissioner Terri Cook, one of three out of four Williamson County Commissioners who’ve called on Chody to step down from the top job.
This week, Ambler’s grieving father called for justice. In an interview on Tuesday, while holding back tears, Ambler Sr said:
He's my buddy. I'm sorry, I'm not as tough as his mom. I'm tough on certain things, but I'm not tough when it comes to my boy.
He's my only son. We go fishing together. When it was Thanksgiving, we looked forward to him being here because he was the one that graced the table.
Everything has changed since he was taken from us.