BOSTON — In the months leading up to a fatal double shooting, Aaron Hernandez had become increasingly convinced that people had been “testing, trying or otherwise disrespecting him” when he went to nightclubs, prosecutors said.

When a man bumped into Hernandez while dancing, spilling his drink, that may have been the last straw. Authorities say the former New England Patriots star followed the man and his friends, then opened fire on their car, killing two men and wounding a third.

“I think I got one in the head and one in the chest,” Hernandez said to a friend as they raced from the intersection where the victims were shot as they sat in their car, prosecutors said at the former tight end’s arraignment.

Hernandez, already charged with killing another man last year, pleaded not guilty Wednesday to seven charges — including two counts of first-degree murder — in the 2012 shooting that killed Daniel de Abreu and Safiro Furtado.

The night de Abreu and Furtado were killed, Hernandez and a friend drove from Connecticut to a Boston nightclub called Cure, Suffolk County First Assistant District Attorney Patrick Haggan said. They were standing at the edge of the dance floor when de Abreu accidentally bumped into Hernandez, smiled at him and did not apologize, according to prosecutors. Haggan said de Abreu and his friends did not appear to recognize Hernandez and had no idea he was upset.

Hernandez became increasingly agitated and told his friend that de Abreu had deliberately bumped into him and “was trying him,” Haggan said.