Aaron Hernandez Update: Video shows embattled NFL star with 2012 double-homicide victims, report says

(CBS) - Authorities have obtained surveillance footage that shows former NFL star Aaron Hernandez and two men killed in an unsolved double-murder in Boston last summer at the same nightclub just hours before the men died, multiple law enforcement sources say, according to the Hartford Courant.

PICTURES: NFL tight-end Aaron Hernandez

PICTURES: Notable athletes involved in murder-related cases

Hernandez, 23, is already facing murder charges in the June 17 death of 27-year-old Boston semi-pro football player Odin Lloyd. He has pleaded not guilty and is being held without bail. No charges have been filed against Hernandez in the 2012 double-murder, but the Boston Globe reported in late July that prosecutors had begun making the case to a grand jury that he should be charged in those deaths.

READ: Timeline of Aaron Hernandez murder investigation

Following Hernandez's arrest June 26 in the death of Lloyd, reports began to surface linking the former New England Patriots tight-end to the 2012 double-murder. While sources previously confirmed to CBS Boston that Hernandez was being looked at in connection with the crime, Boston Police Chief Ed Davis would only say the double-murder investigation had some new life.

Safiro Furtado, 28, and Daniel Abreu, 29, both of Dorchester, were gunned down around 2 a.m. July 16, 2012 as they sat at a traffic light in Boston's South End. A third person was wounded. A silver SUV with Rhode Island plates was reportedly seen speeding away from the drive-by shooting. No arrests were ever made in the case.

On June 28, a silver SUV reportedly matching the description of the car Boston police had been looking for in connection with the double-homicide was towed from Hernandez's uncle's home in Bristol, Conn. at the request of police.

The home where the car was towed from is also believed to have housed two Hernandez associates, Carlos Ortiz and Ernest Wallace, who also face charges in the death of Lloyd.

Lloyd, a semi-pro football player who had been dating the sister of Hernandez's fiancée, may have been killed because he had information about Hernandez's possible involvement in the double-homicide, sources previously told CBS Boston.

The motive behind the killings of Furtado and Abreu, friends who worked for a cleaning company, remains unknown. According to the Boston Globe, their relatives have said the men did not know Hernandez and neither man had a criminal record.

CBS Boston reports Boston Police Commissioner Ed Davis has said investigators believe the shooting stemmed from a fight at a nightclub earlier that night.

Last month, police said they uncovered a gun used in the murders of Furtado and Abreu, CBS Springfield reported. The .38 caliber Smith and Wesson revolver was reportedly found in the car of Jailene Diaz-Ramos, 19, of Bristol, after she was involved in an accident June 21 in Springfield, Mass.

The gun was in the trunk tucked away in suitcase along with three rounds of ammunition.

State police sources reportedly told CBS Springfield that ballistics testing confirmed that bullets matched those found at the scene of the killing of two men outside a Boston bar in July 2012.

Diaz-Ramos reportedly told police the gun ended up in her possession after an individual known by the name "Chicago" and some of his football player friends put belongings into her trunk, CBS Springfield reported.

Diaz-Ramos is charged with firearms violations.

Hernandez is scheduled to be arraigned on murder and weapons charges in the death of Lloyd Friday in Fall River Superior Court in Massachusetts, the Hartford Courant reports.

Complete coverage of Aaron Hernandez on Crimesider