A newly released warrant sheds light on why authorities started investigating former NFL star Aaron Hernandez's possible role in an unsolved Boston double homicide in July 2012.
Whether Hernandez was believed to be directly involved in the drive-by shooting and what his motive might have been are not stated in the warrant and accompanying eight-page affidavit.
No charges have been filed and authorities have not commented publicly on the investigation, but a grand jury has been looking into Hernandez's possible connection.
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The 23-year-old was indicted in August 2013 for first-degree murder and weapons charges related to the death of his friend, Odin Lloyd. Hernandez has pleaded not guilty.
Authorities were prompted to take another look at surveillance tapes from the Boston shooting due to two factors: A tipster called to say he had information that the Boston shooting was connected to Lloyd's slaying and detectives had also remembered seeing Hernandez on the surveillance video after watching news coverage of his possible connection to Lloyd's slaying.
The footage was taken from several cameras, including one in a nightclub and one from a nearby parking garage, according to court documents.
Authorities recognized Hernandez driving a silver Toyota 4Runner into a parking garage just after midnight on July 16, 2012, according to the warrant. About a half hour later, Hernandez is seen with another man later identified as Alexander Bradley following the soon-to-be victims of the double homicide and two other men as they entered the nightclub Cure about midnight, the affidavit adds.
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Ten minutes later, "after consuming two drinks," Hernandez is seen leaving Cure with Bradley, the document says.
At about 2:20 a.m., a video reviewed by police showed the same silver SUV looping around the block "at a very slow rate of speed" after the victims leave the club and enter a parking garage, the documents show.
A short time later, police said, victims Daniel Abreu and Safiro Furtado, were fatally shot in a 2003 BMW. Two others in the car survived. There is no video of the shooting.
The warrant confirms that a vehicle discovered in the garage, which is believed to be the one described in the double homicide, is the same SUV given to Hernandez by a dealership in return for promoting its business.
Hernandez has been holed up in a Massachusetts jail cell since his arrest for Lloyd's slaying on June 26. He was cut by the New England Patriots just hours after being placed in cuffs.
Defense attorney Michael Fee has said that he is pleased his client will have "a path to trial," and that a jury will find Hernandez "innocent."
If convicted of Lloyd's murder, Hernandez could face a maximum sentence of life in prison without the possibility of parole.
CNN Wires contributed to this report.