死 death

夕 (evening) +

(heel) + 一 (one/line radical)

★★★★★

6 strokes

Onyomi

SHI	Evening, plus heel, plus one line on top- which we'll consider a GIRDER for the purposes of this mnemonic! SHE died last evening from having her heel crushed under a falling girder.

し*ぬ	to die ★★★★★

死体(したい)	corpse ★★★☆☆ 死 (death) + 体 (body) = 死体 (corpse)
死刑(しけい)	death penalty ★★☆☆☆ 死 (death) + 刑 (penalty) = 死刑 (death penalty)
死神(しにがみ)	god of death - the Grim Reaper ★☆☆☆☆ KUNKUN NOKURI 死 (death) + 神 (GOD kanji) = 死神 (god of death - the Grim Reaper)
死姦(しかん)	necrophilia ☆☆☆☆☆ ABU 死 (death) + 姦 (rape) = 死姦 (necrophilia)

	Meaning	Hint	Radical
花	flower	POLLEN
死	death	EVENING	夕

For the sake of this mnemonic, let's call the 2 vertical strokes on the flower's top radical . . . 2 spores of pollen.

The poison flower has POLLEN that you're breathing,

and then it makes you die in the EVENING.