An oil tanker crew member allegedly saw a 66-year-old man, who has been charged with murder, punching the victim before he was found with a stab wound to his chest on an oil tanker moored at Aloha Tower, according to court documents.

Jong Geun Byun made his initial court appearance at District Court Wednesday after he was charged with second-degree murder in the death of a crew member identified in court records as Jong II Kim.

Byun’s preliminary hearing is scheduled for Thursday. He remains in custody in lieu of $500,000 bail.

Court documents detailed what crew members heard and saw at the time of the stabbing that occurred aboard the vessel named Hai Soon 39 that was moored at Pier 10 on the Ewa side of Aloha Tower.

At about 1:10 a.m. Friday, a crew member told police he opened the door of his room when he heard loud noises and observed Byun arguing with Kim.

Kim then walked into the witness’ room. Police said Byun followed him, pushed the witness out of the room and locked the door. Byun and Kim were the only individuals inside the locked room.

The witness left the area and returned shortly after but the door was still locked. Police said he left to look for other crew members to assist him.

When the witness returned, he saw Kim “laying on his back with blood on his chest as other crew members applied first aid,” the court document said.

Byun was observed standing inside the same room as the crew administered first aid.

Another witness told police he saw Byun punching Kim.

Emergency Medical Services arrived and transported Kim to The Queen’s Medical Center where he was pronounced dead from a stab wound to his chest, court documents said.

Police arrived and arrested Byun on suspicion of second-degree murder.

According to the MarineTraffic website, Hai Soon 39’s home port is in Avatiu, Cook Islands.

The oil tanker, which was scheduled to depart Honolulu last Friday, is currently docked at Pier 19 at Honolulu Harbor as police continue their investigation.