Kevin Scott said his brother, Erik, was shot several times and killed by three Las Vegas police officers outside a Costco shopping center July 10.
Police claim Erik Scott was destroying merchandise inside the store and pointed a gun at officers before he was shot, but Kevin Scott claims several witnesses never saw his brother holding a gun.
"I know for a fact being raised by my dad and how important gun safety was that we don't even point a BB gun at anyone, a fake gun," Scott said. "Gun safety was number one from the beginning."
Family members said police have not released the 911 tapes or surveillance video from the incident.
"The easiest way to get to the truth, in our opinion, is simply to look at the Costco surveillance videos, which they have not released, which (Las Vegas police) says there was a glitch and they may not have a video," Scott said. "As a family trying to get answers, that story just doesn't make any sense to me."
That led friends and family to pay for the sign that flew high in the sky on Saturday. They said they hope the message will put public pressure on authorities.
"People that didn't know him are going to see the banner flying around," Scott said. "They're going to look it up online and they're going to see this very questionable situation of a West Point cadet that has an MBA from Duke (University) that supposedly pointed a gun at a police officer in front of Costco. That makes no sense. So those people are going to put further pressure on Sheriff (Doug) Gillespie to release the video tapes, to demand the truth to get to the bottom of this."
The banner flew above Huntington Beach for about four hours.
A jury in Las Vegas will now have to decide if the officers were justified in this shooting, but the Scott family again criticized that process because they will not be able to present any witnesses.