Yes, why not. All those statements are essential to the story. This case is unusual, probably unique, taking it as an honour killing rather than a crime passionel, because it is not a case of a Muslim killing another Muslim. The victim was not one and the crime could therefore be described as the first white honour killing
Honour killing is not confined to Muslims, of course, but those in Britain have become associated with Muslims.
You don't appear to get the point, AOG. Mentioning someone's country of origin, there religion,their colour or their 'race' is perfectly right if it is relevant to the story. When it is of no relevance, what is the purpose of mentioning it ? One purpose is 'dog whistle'; hinting indirectly at something which appeals to some, a message to them, but which others will not notice. So, if your audience or readership, or part of it, dislikes immigrants, you may appeal to that by saying in your headline, for example, that the person concerned is a Polish suicide when his country of origin is entirely irrelevant.