Samson - Judges 16:29-31
By collapsing a building, Samson sacrificed his own life, but in the process destroyed thousands of enemy Philistines.  Samson's case was different. And while his life was not a model for holy living, Samson was honored among the faithful heroes of Hebrews 11. Some consider Samson's final act an example of martyrdom, a sacrificial death that allowed him to fulfill his God-assigned mission.
Judges 16:29-31King James Version (KJV)
29 And Samson took hold of the two middle pillars upon which the house stood, and on which it was borne up, of the one with his right hand, and of the other with his left.
30 And Samson said, Let me die with the Philistines. And he bowed himself with all his might; and the house fell upon the lords, and upon all the people that were therein. So the dead which he slew at his death were more than they which he slew in his life.
31 Then his brethren and all the house of his father came down, and took him, and brought him up, and buried him between Zorah and Eshtaol in the buryingplace of Manoah his father. And he judged Israel twenty years.