Joanna Hall murder: Steven Williams's fingerprints on knife
The fingerprints of a man who denies stabbing his girlfriend more than 40 times were found on the murder weapon, a jury has heard.
But Steven Williams, 30, said he had previously washed and handled the knife before putting it away at Joanna Hall's flat in Tenby, Pembrokeshire.
The pair had been dating each other for a short time before she was attacked in last March, Swansea Crown Court heard.
Ms Hall died three weeks later but identified Mr Williams as her killer.
On Wednesday, the court was told Mr Williams was at Ms Hall's flat during the early hours of 16 March but left for a short time at around 07:30 GMT to go to a supermarket.
He said he found Ms Hall severely injured on his return.
Elwen Evans QC, prosecuting, asked Mr Williams why his fingerprints were on the knife.
He replied that he had used the knife before, handling it when washing and putting it away.
Mr Williams said he did not see a knife with blood on it.
Ms Evans continued: "Your jeans were bloodstained when you walked to Sainsbury's, weren't they?"
"Not that much," he replied.
Ms Evans repeated the question and Mr Williams replied: "I'm not sure."
"You had already stabbed and injured her dreadfully before you went to Sainsbury's, hadn't you?"
"No," replied Mr Williams, who suggested the blood was left there from another occasion when Ms Hall had apparently tried to harm herself.
He said he found Ms Hall injured on his return from the supermarket, but he panicked and waited half an hour to dial 999.
When the police arrived, Ms Evans said Mr Williams was "laughing one minute" and angry the next.
"Is that how you were behaving with them?" she asked.
"Not sure," he replied.
"Do you accept you were laughing during the 999 call?" she continued.
"Yeah," Mr Williams replied.
'I was panicking'
Earlier, he told the court why he waited half an hour to call for help when he found Ms Hall injured.
"I didn't know what to do. I'd never been in that situation, It didn't cross my mind [to get help]," Mr Williams said.
Ms Evans asked: "Was it that you didn't know what to do because you caused those injuries, Mr Williams?"
"No," he replied.
"It didn't cross my mind, I was panicking, I didn't know what to do."
"So you were going to leave her to bleed to death?" Ms Evans said.
"No," Mr Williams replied.
Ms Evans added: "You were more worried about her, that you waited half an hour to call the police - that's your evidence, is it?"
"Yes," he said.
Earlier in the trial, the court was told that while being treated in hospital Ms Hall told her sister Georgia Marwick that Mr Williams stabbed her after an argument.
Ms Marwick said Mr Williams smoked cigarettes afterwards and told Ms Hall, "will you just die?"
The trial continues.