From Monarchists.Wiki

Herodias (Hebrew: הרודיאס, Greek: Ἡρωδιάς) was the mother of Salome. She left her first husband Herod II (Herod Philip I) in order to marry Herod Philip's half-brother Herod Antipas. Her story is recounted in the Gospels.

Herod Antipas' marriage to his half-brother's wife was unlawful under Mosaic Law, and John the Baptist criticized Herod Antipas for breaking Mosaic Law. Herod Antipas had John the Baptist imprisoned, and although Herod Antipas sought to have John executed, Herod Antipas refrained from doing so out of fear.

Herodias' daughter Salome performed a seductive dance and secured a promise from Herod Antipas to get Salome whatever she asked. Salome approached Herodias about this, and Herodias had her daughter request John's severed head on a platter. Herod Antipas had the request carried out: John was executed and his head was given to Salome on a platter. Salome then gave the head to Herodias.

But when Herod’s birthday came, [his niece Salome], the daughter of Herodias danced [immodestly] before them and pleased and fascinated Herod, so much that he promised with an oath to give her whatever she asked. She, being coached by her mother [Herodias], said, Give me here on a platter the head of John the Baptist. The king was distressed, but because of his oaths, and because of his dinner guests, he ordered it to be given her. He sent and had John beheaded in the prison. His head was brought on a platter and given to the girl, and she brought it to her mother [Herodias].

— Matthew 14:6–14:11 (AMP)

Herodias had a grudge against John and wanted to kill him, but she could not, because Herod feared John, knowing that he was a righteous and holy man, and he continually kept him safe. When he heard John [speak], he was very perplexed; but he enjoyed listening to him. But an opportune time [finally] came [for Herodias]. Herod on his birthday gave a banquet for his officials (nobles, courtiers) and military commanders and the leading men of Galilee. Now [Salome] the daughter of Herodias came in and danced [for the men]. She pleased and beguiled Herod and his dinner guests; and the king said to the girl, Ask me for whatever you want and I will give it to you. And he swore to her, Whatever you ask me, I will give it to you; up to half of my kingdom. She went out and said to her mother, What shall I ask for? And Herodias replied, The head of John the Baptist! And she rushed back to the king and asked, saying, I want you to give me right now the head of John the Baptist on a platter! The king was deeply grieved, but because of his oaths and his dinner guests [who might have regarded him as weak], he was unwilling to [break his word and] refuse her. So the king immediately sent for an executioner and commanded him to bring back John’s head. And he went and had John beheaded in the prison, and brought back his head on a platter, and gave it to the girl; and the girl gave it to her mother.

— Mark 6:19–6:28 (AMP)

John's disciples buried John's body and told Jesus about it.