An anonymous tip helped officers on Wednesday to arrest the alleged triggerman in the killing of an Horry County man and the assault on his brother, which occurred May 16 on Johns Island.

Denzel Marquis Heyward, 20, of Harvey Avenue in North Charleston is the third person being held in connection with the killing of Kadeem Chambers, 20, of Longs in Horry County, and the beating of his brother, Jujuain Hemingway, 17. Both men were assaulted and robbed after being forced from a parked vehicle on Cynthia Drive, Charleston County Sheriff’s Office Maj. Jim Brady said.

Heyward was picked up without incident about 12:30 p.m. at his home by U.S. marshals and sheriff’s deputies, an incident report states. He is charged with murder, attempted murder, armed robbery and possession of a firearm during the commission of a violent crime, Brady said.

On May 22, Dashaun Livaughn Simmons 19, of Delano Street turned himself in at the Cannon Detention Center. Simmons faces the same charges as Heyward, and both suspects are being held at the Cannon Detention Center. A bond hearing for Heyward is set for today.

A woman is being held as an accessory. On May 20, Quansantrina Jaeureka Rivers, 22, of West Surrey Street in North Charleston was charged with accessory after the fact of murder, accessory after the fact of attempted murder and accessory after the fact of armed robbery. Her bail was set at $225,000.

Brady said investigators believe the four men had planned to meet that evening on Johns Island. The purpose of the meeting remains a subject of investigation, he said.

Deputies who responded to a reported disturbance involving gunfire found Chambers in the driver’s seat of a Mercedes sedan, bleeding from bullet wounds. The Mercedes had crashed into a parked truck. Hemingway was found on a nearby street.

Chambers later died at Medical University Hospital. According to warrants, before he died, Chambers told deputies he was shot by a man named “Fat.” Investigators determined he was referring to Heyward, warrants state.

Hemingway told investigators that he and his brother were forced from the Mercedes and ordered onto the ground. Hemingway heard his brother tell the assailants, one of which was armed “with a rifle-type long gun,” that he did not have any money, warrants state.

Hemingway reported that a man standing over him fired a shot that struck the ground next to his head, and that he was kicked in the face and head multiple times. Hemingway managed to crawl away from the shooting scene.

Warrants state Rivers reported she drove two friends to Johns Island, and that she remained in the car while they got out. She maintained she heard shots, after which the two men she’d been driving around jumped back into her car, yelling at her to drive on.