[Jonty30]

Samson committed suicide, but he’s counted amongst the righteous.

[Rashputin]

Samson prayed that he would be granted the strength to destroy the enemies of God and the mercy to die with them. God answered his prayer in the affirmative or he wouldn't have been able to take the building down.

That's a good bit different than blowing your own brains out or jumping off a building.

JMHO

[DuncanWaring]

I think there's a distinction from suicide if you're doing something generally meritorious and die from it, even if you know beforehand you're very likely to die.

As an example, Cmdr. Howard Gilmore.