PITTSFIELD — In the aftermath of the assault and shooting that nearly claimed the life of Nick Carnevale, investigators found shell casings, a "butterfly" knife and a bullet lodged in the steering column of his truck.

The early steps of the investigation into the August 2018 incident occupied the bulk of Tuesday's testimony in the trial of Kevin Nieves and Daquan Douglas.

The pair, along with Christopher Frazier and Luis Delvalle-Rodriguez, have all pleaded not guilty to charges connected to the shooting.

Nieves and Douglas are on trial in Berkshire Superior Court; Frazier and Delvalle-Rodriguez are expected to be tried together as early as May.

According to witnesses, a party held late Aug. 20 at the Ashley Reservoir was organized via social media sites Snapchat and Facebook.

Carnevale, of Cheshire, attended along with two of his friends, one of whom was allegedly warned by Nieves to not attend the party with Carnevale.

Nieves is accused of making threats toward Carnevale in those messages. Carnevale was not told about that message exchange before attending the party.

When the group tried to leave, Carnevale's truck became stuck in the mud and a group approached the vehicle and eventually forced Carnevale out of the truck.

A fight broke out and moments later gunshots were fired, prompting most of the crowd to scatter.

Investigators recovered five spent shell casings in the area around the truck and found one bullet in the steering column of the truck.

Photos of the scene showed a shattered driver's side window and a bullet hole in the door.

According to Assistant Berkshire District Attorney Joseph Yorlano, Carnevale was struck twice; once in the back and once in the head.

Investigators also found a folding butterfly knife on the ground near where Carnevale was found.

Not long after the shooting, Douglas arrived at Berkshire Medical Center with an apparent stab wound and other injuries indicating he'd been in a fight.

He told police he was attacked while playing late-night basketball in either Lee or Lenox, an account investigators have called implausible.

Neither Douglas nor Nieves are accused of pulling the trigger; prosecutors have identified Delvalle-Rodriguez as the alleged gunman. The two are being charged under a theory that they, along with the others, were all accomplices in the assault.

Both men have pleaded not guilty to charges of armed assault with intent to murder, assault and battery with a dangerous weapon causing serious bodily injury, assault and battery with a dangerous weapon, armed kidnapping with serious bodily injury, armed kidnapping, assault and battery and malicious damage to a motor vehicle.

Douglas has also pleaded not guilty to one count of witness intimidation.

Testimony is scheduled to resume Wednesday morning in Berkshire Superior Court.

Bob Dunn can be reached at bdunn@berkshireeagle.com, at @BobDunn413 on Twitter and 413-496-6249.