Here's a few key moments from the prosecution's opening statement today:

• The attack on Ian Watkins in his prison cell lasted about "20 seconds", with Rico Gedel “perky” after he was detained by prison officers
• Watkins had received two notes the day before he was killed accusing him of getting another prisoner kicked off the wing, demanding money and threatening violence
• Gedel had been moved into the same wing as Watkins and Samuel Dodsworth the day before the attack and was “coincidentally” placed in the cell next to Watkins
• Staff were unable to resuscitate Watkins and he was declared dead at 10:14 on 11 October
• Gedel later shared words with a prison officer to the effect of: "If I’m going to do life for murder, I’m going to make sure it’s worth it’, according to the prosecution
• Prosecutors told the court some prisoners choose to "take the law into their own hands" for crimes involving children

A full story about the trial so far can be found here.

For those who are just joining us, here's a brief recap of the evidence heard so far in the case:

• Former rock star Ian Watkins was stabbed to death in his cell at HMP Wakefield, where he was serving a 29-year sentence for child sexual offences
• Fellow prisoner Rico Gedel entered Watkins' cell with a home-made knife while the cell was unlocked, the jury was told, with Watkins gaining fatal head and neck injuries
• Prosecutors say co-accused Samuel Dodsworth then took the weapon from Gedel and threw it in a bin
• Both men deny murder and possessing an offensive weapon inside a prison

After listening to the prosecution's opening statement and watching CCTV footage from the prison, jurors are told the hearing is ending for the day.

Judge Mr Justice Nicholas Hilliard instructs the jury not to conduct their own research into the case or to discuss it with anyone else.

The case at Leeds Crown Court is expected to resume tomorrow morning.

Prison CCTV footage from the morning Watkins was killed is now being played in court.

In one clip, the defendants are seen emerging from the same cell shortly before Watkins is attacked.

Image source, Getty Images

Seconds after Gedel leaves Watkins' cell, Watkins emerges into view with blood stains on his grey T-shirt.

Nearby workmen are seen notifying prison staff about Watkins' injuries, with staff then running to his aid.

The prosecution "cannot say what lay behind this attack", Mr Storey tells the jury.

However, they say the evidence is "clear" that Gedel carried out the attack, and that it is "equally clear that Samuel Dodsworth encouraged and assisted him".

That brings the prosecution's opening statement to a close.

During his questioning, Dodsworth asked police if they had CCTV footage of the attack.

He claimed it would show he was not involved, the prosecutor tells the court.

Dodsworth told police he had no issue with Watkins and there had been no pre-planning on his part, adding he had been "in the wrong place at the wrong time".

He told officers he had tried to give the knife back to Gedel after he was passed it on the landing.

After both defendants were taken to different police stations, Gedel initially answered the police questions with “no comment”, the jury hears.

He later told police he found it "disgusting" that there was no separation between sex offenders and prisoners convicted of other offences at HMP Wakefield.

Mr Storey says the weapon consisted of a "Stanley knife-type blade" fixed into some sort of blue plastic.

It had multiple layers of tape "wound around it to form a grip".

"Blood was found on both sides of the blade," he adds.

Mr Storey says prison staff commented on Gedel's "perky demeanour" in the aftermath of the attack on Watkins.

The prosecutor tells the court Gedel shared words to the effect of: “If I’m going to do life for murder, I’m going to make sure it’s worth it.”

Mr Storey says Gedel told the same officer: “If I’ve killed him, you could be talking to someone famous."

Dodsworth later told a prison officer he had hidden a weapon in a bin in the recess area on B wing, the jury hears.

Mr Storey says a weapon was placed in a bin in a recess area Dodsworth had been seen walking in and out of, according to a prisoner present at the time.

"At the bottom of one of the bins they found what looked like a home-made knife with tape wound around it, and which appeared to have blood on it," he tells the jury.

Watkins was able to identify who had entered his cell, Mr Storey tells the court, despite his serious injuries.

Gedel was detained by prison staff shortly afterwards.

Mr Storey says Gedel "appeared to find the situation amusing", according to a prison officer present at the time.

Prison staff saw Watkins emerge from his cell "bleeding from wounds to his face", the courtroom hears.

Mr Storey says the 48-year-old suffered a "serious" wound to his neck during the attack and lost consciousness shortly afterwards.

Despite attempts from prison staff to revive him, he was declared dead at 10:14.

Mr Storey says Gedel was in and out of Watkins' cell within a period of about "20 seconds".

Dodsworth had been watching his co-defendant as he entered the room, the jury hears.

Moments afterwards he was passed something by Gedel, Mr Storey says, with Dodsworth placing it in his pocket.

Watkins had chosen to stay inside his cell despite it being unlocked, Mr Storey tells the court.

Prior to the attack taking place, prison CCTV shows the defendants talking to each other and another man before separating.

Storey says Gedel is then seen on the landing outside Watkins' cell, "in all likelihood waiting for a moment when the prison officers on the landing were out of sight".

Mr Storey says Gedel was "entirely coincidentally" moved into the cell next door to Watkins the evening before he was killed.

Dodsworth was already housed on the opposite side of the prison wing's landing, the jury hears.

Prisoners had been allowed outside of their cells on the morning Watkins was fatally attacked, he adds.

Watkins, described in court as "a particularly notorious and high-profile prisoner", received two notes the day before he was killed, Mr Storey tells the court.

They accused him of "getting another prisoner kicked off the wing, demanding money from him and threatening violence towards him".

Image source, PA Media

The prosecutor says HMP Wakefield is the sort of environment where “grassing” or “snitching” on others "is viewed in a poor light".

One of the wounds inflicted on Watkins "cut through his jugular vein and the surrounding muscle tissues", the jury hears.

Mr Storey tells the jurors there are some crimes, including sex crimes against children, which are "so heinous they defy belief".

Some people take the view that imprisonment alone "is not severe enough", he adds.

He continues: "On occasion, some people decide simply to take the law into their own hands and to enact their own form of punishment upon such offenders."

The prosecution has started to open its case.

Prosecutor Tom Storey KC tells the court Rashid Gedel attacked Watkins inside his cell on the morning of 11 October and stabbed him three times, causing wounds to his head and neck.

Samuel Dodsworth then hid the weapon, the jury hears.

"The intention [...] was that Ian Watkins should be caused, at the very least, very serious harm," the prosecutor tells the jury.

The jury of five men and seven women have just been sworn in here at Leeds Crown Court.

The judge for the case, Mr Justice Nicholas Hilliard, has told them the trial is expected to last for three weeks.

We are about to get under way.

Watkins was once one of Wales' most recognisable musicians - the frontman of the rock band Lostprophets.

Formed in Pontypridd in 1997, Lostprophets sold millions of albums around the world and commanded arena crowds.

But the group disbanded immediately after Watkins was convicted in 2013.

During his trial, prosecutors described Watkins as a man corrupted by fame, drugs and power and called him "a determined and committed paedophile".