image source, West Yorkshire Police caption Sebastian Kalinowski, 15, was found unconscious at a Leeds Road property in Huddersfield in August A mother appeared in court to deny the murder of her teenage son. Sebastian Kalinowski, 15, died after being found unconscious at a property in Leeds Road, Huddersfield, in August . His mother Agnieszka Kalinowska, 34, and Andrezej Latoszewski, 37, have been charged with his murder. The couple, from Leeds Road, Huddersfield, appeared in court on Wednesdayof the Crown of Leeds to plead not guilty. Both were remanded in pre-trial detention in June 2022. West Yorkshire police have previously said Sebastian, from Poland, suffered a number of physical injuries. Follow Hfrance.fr Yorkshire on Facebook , Twitter and Instagram . Send your article ideas to email protected> email .