Jamieson, Fausset and Brown on Judges 16:28

28. Samson called unto the Lord--His penitent and prayerful spirit seems clearly to indicate that this meditated act was not that of a vindictive suicide, and that he regarded himself as putting forth his strength in his capacity of a public magistrate. He must be considered, in fact, as dying for his country's cause. His death was not designed or sought, except as it might be the inevitable consequence of his great effort. His prayer must have been a silent ejaculation, and, from its being revealed to the historian, approved and accepted of God.