...turning his face towards the house of Bahá'u'lláh, took his life by cutting his throat.

The story of Dhabíh is that of a passionate lover. The object of his adoration was Bahá'u'lláh, Who had ignited within his breast the fire of the love of God, a fire so intense that it began to consume his whole being. Eventually he reached a state where he would neither eat nor drink. For forty days he abstained from food. Unable, at last, to check the crushing force of love which pressed upon his soul, he came one day, at the hour of dawn, to the house of Bahá'u'lláh and for the last time swept its approaches with his turban. After performing this task, he paid a visit to the home of Áqá Muhammad-Ridá where he met some of the friends for the last time. Later he obtained a razor, went to the bank of the Tigris and there turning his face towards the house of Bahá'u'lláh, took his life by cutting his throat.

ROB, Adib Taherzadeh, Vol 1, Page 103

http://www.peyman.info/cl/Baha%27i/Others/ROB/V1/p096-104Ch08.html