Peter John Carroll used a steering wheel lock to hit Marcus Luke Tucker several times, in an effort to "calm" him down.
"I picked up the steering wheel lock and hit him in the shoulder...I hit him again in the shoulder, he went floppy and stopped moving," Carroll told the High Court at Christchurch today.
Carroll, 53, is on trial for murder after the body of Tucker, 36, was found bashed and burnt near Lake Ellesmere on Anzac Day last year.
The trial began last Monday, when the jury heard that Tucker and Carroll were both involved in the city's drug scene, and Tucker had allegedly been using fake $100 notes to buy drugs days before his death.
The court heard that an associate of Carroll's, whose name is suppressed, was selling drugs for him and had received fake $100 notes from Tucker during a drug deal.