Piece by piece, Corp. John Black put on his Rialto SWAT team equipment to show a jury in the trial Krist Wiggins how he looked on the day a search warrant ended with the death of his colleague, Officer Sergio Carrera Jr.

First came the 30-pound protective vest, then came his duty belt followed by radio, flashlight, handcuffs and more. Prosecutor Cary Epstein then handed Black his AR-15 rifle, which the corporal slung over his chest, and his handgun to slide in the holster.

Black testified Tuesday in Fontana Superior Court that the equipment added up to 40 pounds to his 180-pound frame on Nov. 17, 2007, the day he tangled with Wiggins while serving a warrant at Wiggins' apartment on West Cascade Drive, in Rialto.

At a 5 a.m. briefing the day of the SWAT operation, Black said he learned of his assignment.

"Point man, No. 1," the corporal testified. Part of his duty would be to protect and shield the rest of the officers behind him. "The No. 1 person is always the first person to go in the door," Black said.

Black's testimony in Wiggins's trial is key because he reportedly chased the defendant into a back bedroom, where he tackled him and fought aggressively to control him. During the struggle, Black's rifle fired and fatally struck the 29-year-old Carrera near the bedroom doorway.

Police served the warrant because they believe drugs were being sold from the residence, but no drugs or weapons were found there.

Prosecutors have charged Wiggins with murder and a special circumstance that the victim was a police officer. If convicted, Wiggins could spend the rest of his life in state prison.

After the briefing and various rehearsals in the police parking lot, the SWAT teams from Rialto and Colton police department staged at Base Line and Riverside Drive, making last-minute preparations before boarding a Bear Cat armored vehicle to the location.

Black is expected to continue his testimony Wednesday in Fontana Superior Court.

Earlier in the trial proceedings Tuesday, Officer Carl Jones continued his testimony from the day before. Both Jones and Black said they were briefed that drugs, weapons and gang members could be in the apartment, prompting a heavy response.

Prosecutors asked Jones what the outcome might have been if Wiggins complied with their commands to get on the ground when the SWAT team entered the apartment.

"He would have been handcuffed, without incident," Jones said. Instead, Wiggins ran down a hallway when flash-bang devices were deployed and the officers entered the front door, according to testimony.

When Jones got to the back bedroom, Black was on top of Wiggins, on the ground and fighting face-to-face, he said. Jones could see the barrell of Black's rifle under his right armpit and pointing towards the door opening, he said.

Jones said he drove a Taser into the abdomen of Wiggins, who screamed in pain, for "the full ride." But Wiggins continued to fight with Black, and then the rifle fired.

Black was surprised to learn that it was his rifle that fired, and he didn't realize his rifle went off, according to Jones. The witness said he could not see anyone's hands.

In a conversation later with a sergeant, Jones described the shooting as friendly fire, he said.

"Friendly fire, meaning it came from our weapon, yes," Jones said, agreeing that he used that term.

Carrera later died at Arrowhead Regional Medical Center, in Colton.