Do you have the intelligence to prove a murder ???

There are 5 people living in a house
Alex
Bryan
Rafi
Aleena
Mathew

A call comes to the police station near 9.30 am
Mathew is dead in the house ...

Bryan informs the police ...
The police are calling the people who are joking The interrogation continues

Mathew dies while Alex goes out to repair his damaged phone
Lying down….

Bryan says he was in bed and Alex says he sees Mathew dead and then calls the police.

Rafi says he knew he had coffee in the kitchen, and when Bryan and Alex say ...

Tom is a close friend of mathew ... he was very close to getting information ...

Aleena says she was going out to practice golf and she knew Bryan was calling.
(also added she was living together with brain)

So, after a long interrogation, the clever Ah police officer finds out that the man who said this is wrong and that the detailed interrogation of the victim

Who is the culprit ??

NB: Tell us exactly who the culprit is and how you found it