Hernandez has been in jail since being charged with murder in late June. (USATSI)

Former Patriots tight end Aaron Hernandez is currently in jail awaiting trial after being charged with first-degree murder in the shooting death of Odin Lloyd earlier this summer. Additionally, Hernandez is reportedly the focus of a grand jury probe into a 2012 double-slaying in Boston, as well as a police investigation into Florida shootings that took place in 2007.

While investigators continue the search for the weapon that was used in Lloyd's death, there has been a development in the 2012 double-slaying case, according to Boston's WBZ.

More details via CBS3:

In a state police report, Jailene Diaz-Ramos of Bristol, CT was involved in an accident and taken to Baystate Medical Center.

State police say they took inventory of her car and found a .38-caliber Smith and Wesson revolver in a black briefcase in the trunk.

That gun was sent for ballistics testing, and around two weeks later, state police confirmed it was the weapon used in the killing of two men outside a Boston bar in 2012.

According to court documents, Diaz-Ramos told police that the gun belonged to a friend she called "Chicago." Diaz-Ramos also said that she drove Chicago and his friends to work, and that they were football players. She added that Chicago and his friends wanted to leave a black briefcase in the trunk of her car so they wouldn't have to bring it into work.

Last month, the Boston Globe reported that prosecutors have begun making the case to a Suffolk County grand jury that Hernandez should be charged in the shooting deaths of Daniel Abreu and Safiro Furtado.

“The case against Hernandez appears to be strengthening,” a law enforcement official told the Globe on condition of anonymity.

According to relatives of Abreu and Furtado, Cape Verde natives, neither man knew Hernandez. Both worked for a cleaning company and didn't have criminal records.

“I just want to know for certain, that the person who did this has been caught," Furtado's mother told the Globe. "Until then, what is there for me to say? I just want justice for him. If the police are close to finding out who killed him … well, I just want them to tell me when they actually catch the person. That's what my family waits for.”

Hernandez, meanwhile, remains in jail after being denied bail in the Lloyd case. He has pleaded not guilty to killing Lloyd.