Medusa had two offspring, Pegasus and Chrysaor.
Deuce gorgon
zytan
Perseus.
I'm going to assume that you're asking which son of Zeus killed Medusa, in which case the answer would be Perseus.
Zyzz Shaversarian
Some say that Pegasus jumped out of Medusa's blood after her head was cut off. In these versions, Pegasus was said to be the son of Medusa and Poseidon.
No, he did not. The hero Perseus killed Medusa. Perseus was also Zeus' son but his mom was mortal.
Perseus, son of Zeus, killed Medusa because she turned people to stone -- essentially, because she was a murderer.
In some versions of the myths, yes, he's the son of Poseidon and Medusa. What I read is that he 'sprung' from the body of Medusa after she was slain by Perseus, the son of Zeus. Medusa used to be a beautiful maiden. Poseidon and Medusa were found together in the temple of Athena by Athena. Athena found that deeply disrespectful, and since she could not punish her uncle, she settled for turning his new girlfriend into a hideous monster.
The individual you are referring to is Perseus, a hero in Greek mythology known for slaying Medusa and for being the son of Zeus and Danaë. After defeating Medusa, he used her head as a weapon, including turning the sea monster Cetus to stone to save Princess Andromeda.
Perseus is the demigod son of Zeus that slayed Medusa.
demigod son of zeus, killed medusa