His fingerprint was found at the murder scene, Morgan Huxley's blood was found on his bag and he allegedly had thoughts about killing "for the thrill of it".
But Daniel Kelsall's barrister says the accused killer will explain it all.
Mr Huxley suffered 28 stab wounds after he was attacked in his bed in his Neutral Bay apartment in the early hours of September 8, 2013.
The 31-year-old was discovered by his flatmate lying in blood in his bedroom doorway.
"The likely scenario is that Morgan Huxley was stabbed as he lay on his bed. He managed to get up and made it as far as the doorway before collapsing," Crown prosecutor Peter McGrath SC said.
Kelsall has pleaded not guilty to his indecent assault and murder.
In the opening day of his Supreme Court trial on Wednesday, the jury heard Mr Huxley had been out at a friend's engagement party before being dropped home in a taxi in the early hours of the morning.
Footage in and around The Oaks hotel captured Mr Huxley walking barefoot into the premises and drinking a beer alone.
Meanwhile CCTV shows Kelsall, now aged 22, standing outside a group of shops across the road.
When Mr Huxley leaves around 1.30am, Mr McGrath said Kelsall walks in the same direction.
"He breaks into a very quick walk a couple of times - almost a jog - as though perhaps to catch up to Morgan Huxley."
Sometime around 1.30 to 2am, Mr Huxley's flatmate Jean Redmond told the court she woke up to a knocking on the front door but went back to sleep.
Mr Huxley often left the front door unlocked so his friends could come and go, she explained.
But at about 2.30am she heard a "thump" and got up to check on Mr Huxley.
"He was lying on his right side at the door way ... He had blood all over his face and blood all around the top of his body," she told the court.
Mr McGrath said a print matching Kelsall's ring finger was later found on Mr Huxley's bedroom door, while his DNA was found on the 31-year-old's penis.
Spots of blood on Kelsall's shoulder bag also had the same DNA profile as Mr Huxley's.
In the year before Mr Huxley's death, Mr McGrath said Kelsall had a told a doctor he had "intrusive thoughts about killing people with a knife".
He later told a psychiatrist he had thoughts about killing "for the thrill of it".
But Kelsall's barrister Christopher Watson said his client would address both of these aspects when he gives evidence.
He said it was common for Kelsall, who worked late as a cleaner at a cooking school, to get takeaway food from the shops opposite The Oaks, Mr Watson said.
Extensive searches between the two men's home had also failed to uncover the murder weapon, he said.
The trial continues.
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