Sonic and Tails were sitting on the couch when some dude with a baseball bat came in and started to beat Sonic to death. Sonic was screaming and dying and Tails said "What's wrong? Why you so idiot what's wrong I don't see what's wrong?" Then Tails went up to Sonic and pushed him and said "Wtf is wrong? please tell me Sonic!" As soon as Tails did that Sonic fell down the stairs and cracked his neck and fucking died. Then the dude with the baseball bat used dark magic to ascend into another dimension and he was never seen again. Tails didn't feel guilty even though he was responsible for the death of Sonic The Hedgehog.
The police arrived at Sonic's house to investigate, all they found was a used condom and Sonic's corpse, it's rumored Amy has Sonic's corpse and uses it as a sex toy, but nobody can confirm that. The police questioned Tails but they couldn't find any incriminating evidence that Tails caused Sonic's death, here is the full transcript of the police questioning Tails:
Officer: Where were you the night of the murder
Tails: I was at the local Mcdonald's bathroom forcefully feeding fat bitches big macs, because that's my job.
Officer: Okay you're innocent.
Without Sonic, Tails turned Sonic's house into a crack den which is infested with cockroaches, termites, and other parasitic insects. All was fucking boring until one day...