Former New England Patriots star Aaron Hernandez goes on trial Wednesday in the fatal drive-by shootings of Daniel de Abreu and Safiro Furtado in Boston’s South End in July 2012. Here are three things to watch as the trial progresses:

1.Alexander Bradley: The prosecution’s case rests largely on the word of Bradley, a convicted felon who will testify for the government under an immunity agreement. Authorities contend Bradley was with Hernandez when the former athlete shot the two men. Hernandez is also charged with witness intimidation — authorities say he shot Bradley in the eye in February 2013 in an effort to silence him about the killings.

2.Family members: Neither the victims’ relatives nor Hernandez’s family attended jury selection, but lawyers on both sides have requested that at least 10 seats in Suffolk Superior Courtroom 906 be reserved for family. At Hernandez’s 2014 arraignment, a woman among the group of the victims’ relatives shouted “asesino,’’ Portuguese for killer, when Hernandez entered the courtroom.

3.Patriots ties: Patriots head coach Bill Belichick and offensive coordinator Josh McDaniels have been listed in court filings as possible witnesses in the trial. It is not clear what attorneys would ask the famously taciturn Belichick. Court records indicate that prosecutors may call McDaniels to testify about one of Hernandez’s tattoos. Belichick was listed as a possible witness in Hernandez’s 2015 murder trial in the killing of Odin Lloyd, but neither side called the celebrated coach to the stand. Patriots owner Robert Kraft did testify at that trial, and Hernandez was convicted of first-degree murder and sentenced to life in prison. An appeal of his conviction in that case will be heard at a later date.

Travis Andersen can be reached at travis.andersen@globe.com. Follow him on Twitter @TAGlobe.