Pyramus and Thisbe.
The myth of Pyramus and Thisbe is first attested in Western Literature by Ovid in the Metamorphoses, such that the tradition clearly descends from that text and exemplifies Ovid's pervasive influence. Apollodorus makes no mention of the myth; Hyginus' mentions of Pyramus and of Thisbe among other mythological suicides have no narrative detail.

       Young lovers of Babylon, Pyramus and Thisbe were forbidden by their parents to marry or even to see each other. Living in adjoining houses, they communicated through a chink in the common wall. At length, they decided to meet at night at the tomb of King Ninus. As Thisbe awaited her lover’s arrival, a lioness came to drink at the stream, frightening the girl away, In her flight, Thisbe dropped a cloak, which the lioness tore and bloodied with her teeth. When Pyramus arrived and saw the cloak, he thought that Thisbe had been killed and, blaming himself, committed suicide. Returning to find her lover dead, Thisbe killed herself with his sword. The lovers’ blood turned the fruits of the mulberry tree under which they lay from white to purple.

For Further Reading:
       The Classical Tradition, Grafton, Most, Settis, edd., s.v. "Pyramus and Thisbe" [A.B. Taylor], with bibliography.