He was last seen at his Surrey Hills home about 1:30pm on Friday 28 August.
Police have concerns for Murray’s welfare due to his age and his disappearance is out of character.
Murray is described as 183cm tall, with a thin build and short brown hair.
He was last seen riding his black Giant hybrid bicycle while wearing a black hoodie, grey tracksuit pants and white sneakers.
Anyone with information about Murray is asked to contact the Camberwell Police Station on (03) 9882 0688.