The video, which streamed on Facebook Live and was obtained by Cleveland.com, showed a Thursday-night dinner party in Cleveland, according to the news outlet.
At that Thursday night dinner party, a shooting would occur, and a 27-year-old man would die.
"Guns and alcohol don't mix," the victim's mother, Trina Ford, told Cleveland.com.
The shooting is not included in the video.
But the victim, Anthony Stanford II, and the man accused of killing him, Steven Leannais, can be seen in the footage, according to Cleveland.com.
"I met Steve twice over the weekend and again in court today; he is distraught about the loss of his friend, Anthony Stafford," defence attorney Leif Christman told the Washington Post on Monday. "He wants to apologise to Anthony's family, particularly his mother, Trina Ford. He would do anything to trade places with Anthony if he was able to. He would do anything to take back the accident that happened."
Leannais, who authorities believe was intoxicated at the time of the shooting, has been charged with third-degree felony involuntary manslaughter for the death of Stanford, Cleveland.com reported. Bond was set at $10,000.
"Steve's a 30-year-old man with no prior serious involvement with law enforcement. He's a sensitive, kindhearted person, works hard and really just enjoys life," Christman told the Post. "This is going to be something that he's going to live with for the rest of his life. It's obviously a moment that will change his life forever."
A police spokesman did not immediately return a telephone call or emails. But Cleveland.com writes that the footage "match[es] the descriptions of what police wrote in their report"."
Leannais' attorney confirmed to the Post that the footage was a short clip from the night of the shooting.
Cleveland.com, citing police reports, wrote that the shooting happened after someone at the party grabbed Leannais' gun out of his bedroom.
A small group of friends had gathered at his apartment that night.
The clip obtained by Cleveland.com does not show the shooting itself. After the firearm is flashed before the camera, the footage shows a man in a hat - identified by the outlet as Leannais - taking the magazine out of the firearm, before giving it back to the other man in a sweater.
"I'm going to do it, I swear to God," that man says, holding the gun in his open mouth.
He then says: "The last thing they say is always, 'I didn't know it was loaded'."
"The clip is in here guys," the man in the hat says, as he holds bullets up to the camera. "I have the clip. Magazine, it's right here. Okay? That would have made a bloody mess, look at that. See that hollow point right there? Would have made a bloody mess."
A few seconds later, Stanford comes into the frame, and walks over to the night's dinner. Then the brief clip ends.
Here's Cleveland.com, with an account of how the shooting occurred:
Leannais eventually picked up the gun, lowered it to his side and pulled the trigger, unaware a bullet was in the chamber, according to police reports and court records. The bullet hit Stanford in the upper abdomen, according to the Cuyahoga County Medical Examiner.
Stanford ran out the door after he was shot. Leannais followed and called 911, police reports say.
Assistant Cuyahoga County prosecutor Brian Murphy said that though it was an "unintentional" shooting, Leannais was still responsible, according to Cleveland.com.
Ford, Stanford's mother, remembered her son as a person with a sharp mind for mechanics, who made friends easily.
"If you came across him, you would remember him forever," Ford told Cleveland.com. "If you met 50 people that day, you'd remember him. He was just that way."
Facebook Live launched last year and allows users to stream live video to their Facebook pages, where others can watch in real time, or after the fact. It is used in a variety of ways, from broadcasting breaking news, protests and events to giving lectures or communicating with friends.
Chris Cox, Facebook's chief product officer, told CBS News in April that Facebook Live allowed users to bring "a little TV studio" to their pockets.
It was via Facebook Live that Diamond Reynolds broadcast the aftermath of the fatal police shooting of her boyfriend during a traffic stop in a Twin Cities suburb.
"Stay with me," she told Philando Castile. Her Facebook video quickly spread across social media and cable news, turning the deadly July confrontation into one of the highest-profile fatal police shootings in recent years. Last month, prosecutors in Minnesota charged the officer who killed Castile with second-degree manslaughter.
Since Facebook Live launched, millions have used the service to offer a glimpse into the big moments and small details of their lives.
As the Washington Post's Cleve R. Wootson jnr wrote: "The view isn't always pretty."
In September, a man who had just critically injured his ex-wife and fatally shot his namesake son in North Carolina made a chilling confession on Facebook Live.
"She lied on me, had warrants taken out on me," Earl Valentine told the camera while driving on a dark road. "She drug me all the way down to nothing. I loved my wife, but she deserved what she had coming."
Valentine acknowledged that the violent chain of events he started could end in his own death.
"Pleasure knowing all y'all," he said. "I've been very sick for months. And this is something that I could not help. So I don't know if I'm gonna make it where I'm going, but if I don't, I wish all of you a good life."
Within hours, authorities found Valentine at a motel in Columbia where, they said, he committed suicide after being surrounded.
In June, Larossi Abballa, a terrorism suspect accused of killing a French police captain and his partner in their home, broadcast the aftermath of the attack on Facebook Live. An occasionally tearful Abballa, speaking a mix of French and Arabic, swore allegiance to the Islamic State militant group and encouraged others to follow his example and kill police.
A month later, a Georgia mother went on her daughter's Facebook account to broadcast herself beating the teenager - punishment for posting sexually explicit pictures on the site.
"This is my page now," Shanavia Miller told the camera after she fixed her hair. "Now I'm gonna need y'all to send this viral. Please share this because I'm not done. More to come."
A July shooting in Norfolk that injured three men was inadvertently captured on Facebook Live. In the video, three men are sitting in a car, smoking and listening to rap music. Five minutes into the video, there's a series of 30 gunshots.
And this month, a teenager using Facebook Live while she was behind the wheel was killed in a collision in Pennsylvania. Her 19-year-old passenger also died in the crash.