A Hong Kong man has admitted killing his mother at a public rental flat four years ago under the delusion that she was a “monster lizard” who had pretended to be his family.Wong Chun-kit, 28, on Tuesday pleaded guilty to manslaughter on grounds of diminished responsibility, after prosecutors acknowledged he had suffered a relapse of schizoaffective disorder that substantially reduced his culpability in what was originally classified as a murder case.The High Court heard that Wong, who was...