GEORGETOWN (KXAN) — Demonstrators marched from the Williamson County Sheriff’s Office to the Williamson County Courthouse Saturday, as part of a peaceful protest in support of Javier Ambler’s family.

Ambler died in custody of Williamson County Sheriff’s Office Deputies, following a chase that began in the county and ended in north Austin in March of last year.

Javier Ambler’s sister, Kimberly Jones spoke during Saturday’s march on the Williamson Courthouse steps.

“Everybody around him that saw him would say, oh he looks big and scary. He had the biggest heart, he would give you the shirt off his back,” said Jones. “Hearing somebody beg for their life and you not doing anything to save them, but to harm them is just heartless.”

According to Travis County District Attorney Margaret Moore, Ambler was tased four times after telling law enforcement he had a congenital heart defect. In body camera footage from an Austin Police officer who responded, Ambler could be heard saying, “I have congestive heart failure,” and, “I can’t breathe.”

Javier Ambler’s sister says she and her family members haven’t seen the video.

“My family and I, we haven’t seen the video. We haven’t watched the video, because I don’t want to remember him that way,” said Jones. “I want to remember my protector, I want to remember the person that loved me most.”

According to a custodial death report filed with the Texas Attorney General’s Office, the manner of Ambler’s death was ruled a homicide with the cause of death listed as “congestive heart failure and hypertensive cardiovascular disease associated with morbid obesity, in combination with forcible restraint.”

Moore says the Williamson County Sheriff’s Office has “stonewalled” the investigation into Ambler’s death by not allowing Live PD reality show footage of the incident to be released. On Tuesday, WCSO said Moore’s office never contacted it regarding the investigation. WCSO then called on “Live PD” to release the footage.

Javier’s sister is calling on the Williamson County deputies involved to be held accountable.

“I’m tired of seeing justice for signs, because somebody got killed by somebody that should have been protecting them,” said Jones. “My nephew is 4-years-old. He asked us the other day… Can you send a letter to God so you can let my daddy know I love him.”

A GoFundMe has been set up for Ambler’s family, and organizers are encouraging people to sign a protest asking for the deputies who tased Ambler to be held responsible for their actions.