Demonstrators gather to remember Alva Braziel

HOUSTON (KTRK) -- On the day that Alva Braziel was laid to rest, his family members and Black Lives Matter protesters say they won't rest until they get justice.

"We just want to know why. Why the police have to shoot him down like that. That's all we want to know is why. That's it," explained Braziel's son, Andre Merchant. "On behalf of my mother, that's all I want to say. Why. That's all I want to know."

Braziel was shot and killed by Houston police officers after midnight July 9 on Cullen near Ward. Surveillance video moments before his death appears to show Braziel pointing a gun at the officers before they shoot and killed him. The police department on Thursday released the body camera video from the officers, but the video does not show the shooting because the cameras were turned on after police opened fire.

VIDEO: Police union says officers followed correct protocol

Police union says officers followed body camera policy during shooting.

"When the body cameras are able to be turned off at the police officer's whim, then we decrease transparency and we decrease trust and it is a waste of our money and a slap in our face. We need convictions. We need police officers brought to justice," said TSU student Anthony Collier.

Mayor Sylvester Turner has repeatedly said the officers' actions were justified. Protesters are demanding accountability and policy changes, like independent citizen review boards.

The protesters marched past the Braziel home as a sign of support for a family still in mourning.

"We're going to get justice though," Merchant said. "That's what we want. We want justice for the whole family."

Protesters plan to return to the same spot on Tuesday and take their message to City Hall next month.