''A teenage boy who stabbed his sister's secret boyfriend to death, when he found him hiding at their home, has been found guilty of manslaughter.''
www.bbc.co.uk/news/uk-england-beds-bucks-herts-46895412
This is an odd case, there's no explanation of how the 16 year old brother knew his sister had male company.
He went to the house, had a knife, and was shouting ''where is he, where is he''.