Martin Bryant ( born 7 May 1967 ) is an Australian criminal who killed 35 people in Tasmania in 1996 , in the Port Arthur massacre . Martin Bryant ( born 7 May 1967 ) is an Australian convicted murderer serving 35 life sentences in a Tasmanian prison . He was convicted of murdering 35 people and injuring 21 others in the Port Arthur massacre , a shooting spree in Port Arthur , Tasmania in 1996 .