INVESTIGATION: A violent man, a call for help and police in the dock over a murder that might have been halted

Louise Aitchison, right, was killed in April last year at her home in East Kilbride, left, hours after calling police to help force Darryl Paterson to leave
Louise Aitchison, right, was killed in April last year at her home in East Kilbride, left, hours after calling police to help force Darryl Paterson to leave