The family of a Maryland man killed in December joined detectives Thursday afternoon in speaking about the case.
Christopher Davon White of Landover was fatally shot Dec. 10 in the Briggs Chaney area of Silver Spring.
His mother, grandfather, brother and sister spoke out about the death and urged the public to assist in the investigation.
In a video shown by police, you can see not just an armed robbery. Police believe you may be watching the motive for a murder.
"We believe the victim was with these individuals earlier on that particular day," says police Capt. Marcus Jones. .And not just with these armed bandits. Police believe Christopher White is one of them, the man in the black jacket.
But within 20 hours of the recording, White lay dead outside the Windsor Apartments off Briggs Chaney Road.
Police aren't talking about a motive of if the armed bandits are suspects in White's murder.
But the victim's mother and other relatives are convinced White knew his killer.
"We believe Christopher probably knew the subject who killed him," Capt. Jones says.
ABC7 confirmed money, cell phones, and drugs were stolen from the robbery victims as they were pulled from a green Camaro and forced onto the pavement of a Sunoco station around 2 a.m., December 10.
But not until recently did they match evidence found near Briggs Chaney Road to evidence found at the Sunoco at the corner of Whitfield Chapel and Annapolis Road in Lanham.
That evidence has White's family hopeful of an arrest.
What sticks with investigators is that this case has grown cold and video of this robbery is their best hope of finding a suspect for murder.
"We can't see their faces because they do have masks," Jones says. "But they do have two very distinct colored jackets."
One jacket is orange, the other white.
Authorities are searching for a metallic brown Scion box-style vehicle with Maryland license plate 1AX3122. It was stolen out of District Heights on Nov. 26, 2012. Police believe the armed robbers in the video and White were last seen in that vehicle.
The Associated Press contributed to this story.