A crazed partygoer dressed as a clown has been convicted of murdering a British male model by beating him so viciously it was impossible to know which injury had killed him. Bhekisani Matabiswana, 26, repeatedly punched and stomped on stranger Luke Harden, 36, in northwest England last year in an attack in the street that prosecutors said was “so sudden, quick and brutal” the professional model had “no chance to defend himself,” the Sun reported . The Zimbabwe-born killer did not know his victim, but ran into him in the street as they both left the same Halloween party, where Matabiswana was dressed as a clown and his then-girlfriend, Natalie Chadwick, as Harley Quinn. Luke Harden Harden, a male model, suffered catastrophic injuries after being beaten by Bhekisani Matabiswana. Nemesis Model Agency / SWNS He tried to blame the model — who was staggering from being drunk and on ketamine — for touching his girlfriend’s face and then throwing the first punch.…