A Perfect Murder

Blackmail a guilty man to murder your victim and make it like a burglary situation. Invite someone to a party at the time as your alibi. When your plan goes teribly wrong, always have a brilliant plan B.

Make a party after the murder. Invite your victim's friends and families and act like nothing happened.

Doing swap murder with a stranger you meet on a train to kill someone the other person wants disposed of. So you won't leave any motive.

Make someone believe that your victim is someone else.

Commit the real murder before the "actual murder" happened, disguise yourself as your victim and talk to random people just to distract the real time of the murder.

Gather with people with same motive as the murderer, so you can blend in.

Gather with people with same motive as the murderer, so you can blend in. And distract the real time of the murder so you can always have an alibi.

Do not really kill your victim (yet) so you can't be prosecuted for murder at the court. Meanwhile, confess everything and act innocent while your evidence seems like will never be found. So you will get away with double jeopardy.

In a dystopian future where murder would be detected before it really happened, the only way to get away with it is to manipulate the system. You make the system detected another murder that happened before and you arrived and killed your victim in exactly the same manner as the first. The first act seen by the system and the later disregarded as an echo vision and would be ignored.

Blame it on the altar ego.

Use the most unlikely witness for prosecution.

Make a burglary situation that looks like your real victim is only accidentally murdered for witnessing another burglar's victim. So you it won't leave any motive toward you.

Give a stranger your identity

Study all the detail of your victims' family and find ways to weave in and out of their lives, gradually endearing yourself to them and gaining the access you need to carry out your murderous plot while you become the most trusted person of your victims.

Do the conventional way, dispose the body somewhere far, remove the evidence that leads to you and there will never be any suspicion towards you because you've never met your victim before.

Make your victim die naturally, seemingly without any intervention

Disguise yourself as one of your victims

The greatest trick the Devil ever pulled was convincing the world he didn't exist. And like that, poof. He's gone.

Kill your victim and move the dead body somewhere else, and blow up the place to remove all the evidence. Before doing that, check in some other place as your alibi, or have another identity as your freepass.

Bring your victim to the place where lays another dead victim and set up the situation like your victim and "the dead body" killed each other.

Abduct your targets and send them back in time 30 years (before time travel was invented) for a "looper" to kill them instantly and dispose of the body in an incinerator. Since the victim didn't exist in that past time period, he wouldn't be missed and there would be no disappearance to investigate. And of course, no body (or "tags", however that worked) to investigate in that future time the victim came from either.