Oystein Aarseth (Norwegian: ['oystein 'os@t]; 22 March 1968 - 10 August 1993), better known by his stage name Euronymous, was a Norwegian guitarist. Euronymous was a founder of and central figure in the early Norwegian black metal scene. He was a co-founder of the Norwegian black metal band Mayhem. He was also founder and owner of the extreme metal record label Deathlike Silence Productions and record shop Helvete.
Aftermath
Vikernes was arrested on 19 August 1993 in Bergen. Many other members of the scene, including Blackthorn and Faust, were also taken in for questioning. The trial began on 2 May 1994. At the trial it was claimed that he, Blackthorn and another friend had planned the murder. The third person stayed at the apartment in Bergen as an alibi. To make it look like they never left Bergen, he was to rent films, play them in the apartment, and withdraw money from Vikernes' credit card. On 16 May 1994, Vikernes was sentenced to 21 years in prison (Norway's maximum penalty) for the murder of Euronymous, the arson of three churches, the attempted arson of a fourth church, and for the theft and storage of 150 kg of explosives. However, he only confessed to the latter. Two churches were burnt the day he was sentenced, "presumably as a statement of symbolic support". Blackthorn was sentenced to 8 years in prison for being an accomplice.  At Euronymous' funeral, Hellhammer (Mayhem's then-drummer) and Necrobutcher (Mayhem's former bassist) decided to continue with the band and worked on releasing the De Mysteriis Dom Sathanas album. Before the release, Euronymous' family asked Hellhammer to remove the bass tracks recorded by Vikernes. Hellhammer said: "I thought it was appropriate that the murderer and victim were on the same record. I put word out that I was re-recording the bass parts, but I never did". The album, which has Euronymous on electric guitar and Vikernes on bass guitar, was finally released in May 1994.  A part of the Norwegian scene considered Vikernes a traitor for murdering Euronymous and turning his back on Satanism in favor of nationalism and Odinism, although Vikernes claims he was never a Satanist and had only used 'Satan' to provoke. They saw Euronymous' death as a significant loss to the scene, and some black metallers "have sworn to avenge Aarseth's death". A few years after the murder, Ihsahn of Emperor said "There's no discipline in the scene anymore, like earlier on around the shop". After his death, a new generation of musicians tried to gain credibility by 'hyping-up' Euronymous, although he was also hailed as "the King" or "Godfather of Black Metal" by bands that had emerged before this new generation. However, many of Euronymous' friends and bandmates "speak of the killing with a tone of indifference". Lords of Chaos remarks: "what is striking [...] is how little they care about the lives or deaths of one another". In the book, Hellhammer, Ihsahn and Samoth claim that Euronymous' death did not affect or at least not shock them. Anders Odden (a friend of Euronymous at the time) said of the murder: "It wasn't odd that he ended up getting killed. He thought he could threaten to kill people without it having any consequences". He added: "I think many people felt relief once he was gone". Writer and musician Erlend Erichsen agreed, saying "Nobody was there to boss them about. The 'black metal police' were gone".

Q: What happened during the aftermath?
A: Blackthorn and another friend had planned the murder.

Q: How did they plan the murder?
A: To make it look like they never left Bergen, he was to rent films,

Q: Did the police question them?
A: However, he only confessed to the latter.
What does "the latter" refer to?
for the theft and storage of 150 kg of explosives.
for the theft and storage of 150 kg of explosives.