Former football star Aaron Hernandez “may have been the shooter” in a drive-by shooting in Boston in 2012 that left two men dead and another wounded, according to newly released court documents.

The assertion is contained in a search warrant affidavit, filed in late June, that allowed detectives to examine a Toyota 4Runner that investigators believe Hernandez was driving the morning Daniel Abreu and Safiro Furtado were gunned down at a stoplight.

Investigators believe the 4Runner, which Hernandez obtained from a Rhode Island auto dealership in exchange for promotional work, was involved in the incident, according to the warrant, which was unsealed this morning.

“There is also probable cause to believe that Aaron Hernandez was operating the suspect vehicle used in the shooting homicides of Daniel Abreu and Safiro Furtado, and may have been the shooter,” a detective wrote in the warrant.

Hernandez, the former Pro Bowl tight end of the New England Patriots, remains behind bars without bail while awaiting trial in the June 17, 2013, killing of Odin Lloyd. Hernandez has pleaded not guilty in the death of Lloyd, a semi-pro football player who was dating the sister of the football star’s fiancée.

The Toyota was found parked in the garage of a home owned by Hernandez’s uncle following his implication in Lloyd’s death.

The investigator who filed the affidavit wrote that he hoped to find fingerprints, gunshot residue and shell casings, according to the affidavit, “since there is reason to believe that the vehicle has remained untouched and stored in an enclosed garage for a year.”

It is not clear what – if any – evidence was recovered when the 4Runner was searched. The 2012 deaths remain the subject of an ongoing grand jury investigation in Suffolk County, where Boston is located.

The warrant also allowed detectives to search a bag of Hernandez’s clothing taken from his uncle’s home in Bristol. According to the affidavit, detectives were hoping to find the clothing Hernandez was wearing the night Abreu and Furtado were killed – a gray baseball cap with a red or orange brim and a red or orange design on the front; a gray T-shirt with a red, green and white design; a pair of gray and white sneakers; a beaded necklace; a set of rosary beads that included a round medallion and a cross.

That first inkling that Hernandez could have been involved in the 2012 killings came after Lloyd’s death. A detective recalled recognizing Hernandez on surveillance footage from a nightclub the victims had visited shortly before they were shot on a highway overpass.

And that initial suspicion was bolstered days later, when a man called police and asserted that the July 16, 2012, shooting, which left a third man wounded, was connected Lloyd’s death. The man said the same person was involved in both killings. He provided enough details about the Boston case to lead detectives to believe that he had intimate knowledge of the shootings.

“Someone accidentally spilled the beans in front of me,” the man told a police dispatcher who asked him how he knew about the possible connection, according to a search warrant affidavit made public in Hernandez’s hometown of Bristol, Conn.