A teenage army cadet who killed his stepfather using a drill, knives and a hammer had Googled 'could a drill go through your skull' just 24 hours before.
Vladimir Ivashikin, who was 16 at the time, made the search on Google on October 28, 2018, the day before he killed his stepfather at their home, a jury has been told.
The 22-year-old denies murder.
READ MORE: Voices told Gosport boy to kill his stepfather with drill
University lecturer Barry Hounsome was found dead on the floor of his home in Southcroft Road, covered in seven bin bags and a note allegedly written by Ivashikin saying 'I am so, so, so, so, sorry'.
Southampton Crown Court heard how Ivashikin admitted to wearing a stab vest and googles during the 'surprise attack' from behind as Mr Hounsome sat working at his desk.
Opening the case yesterday, prosecutor John Price KC told the jury: "Mr Hounsome had indeed fought for his life."
Blood-stained drills were found around the house and a Tesco kitchen knife and a Wickes hammer were discovered in the kitchen sink.
A spray bottle with ammonia inside which the prosecution claimed was used to 'blind and disorientate' Mr Hounsome was also found upstairs.
Ivashikin, a student who was studying for his A-levels at the time and had lived in Gosport since 2011, was arrested after he called the police to confess to the killing - claiming voices told him to do it.
In a recording of the 999 call played in court, he said: "I really feel completely terrible about this.
“He wasn’t attacking or anything. He didn’t do anything wrong.
“Something in my head told me to do it. It wasn’t self-defence or anything.
“It is such a shame because I had such a nice life with my family. I understand the severity of it, I know that.”
Mr Price said he had tried to argue with the voices in his head - but they became 'even more insistent and aggressive'.
The prosecutor described the scene that police were faced with upon entering the house as 'horrific', the violence used 'sustained and extreme' and that it is likely it continued for some time after Mr Hounsome was dead.
Officers found the remains of multiple items of technology that had been destroyed in a microwave, including two USB sticks.
As well as his search history, examination of his phones found graphic images of death and injuries, murder scenes, dismembered bodies and 'human slaughter scenes', Mr Price said.
The court heard Ivashikin had also ordered a number of items including a wire cutter - similar to a cheese cutter, a claw hammer, a centre punch tool, a spark plug and a two litre bottle of ammonia from Amazon 17 days before the attack.
Ivashikin pleaded not guilty to murder but instead pleaded guilty to manslaughter by diminished responsibility.
He was diagnosed with paranoid schizophrenia and was transferred to Ravenswood House Hospital in Fareham.
However, in February 2022 prosecutors said Ivashikin admitted to a nurse that he had 'fabricated' his symptoms, and that he had killed his stepfather because he had wondered 'what it would be like' and 'how powerful it would feel'.
A statement from the nurse, read to the jury, said: "[He] said that his stepfather was 'not a bad guy' and that the [killing] was simply a matter of 'wrong time, wrong place'.
"[He] became considerably more distressed at the memories of, unprompted, appearing to relive the experience.
"Ivashikin said that 'once I started hitting him, I knew that I'd made a mistake', that he 'regretted it' and that he 'just had to carry on and get it over with'.
"Ivashikin compared this situation to 'when an animal is in pain, you have to put it out of his misery’."
He allegedly said: 'The truth is out now……. the game is finally up,' jurors were told.
The murder investigation was reopened with Ivashikin being arrested in January 2023, but continuing to deny murder, the court heard.
The trial continues.
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