John Mark
Mark 6:27BSB·traditional attribution

So without delay, the king commanded that John’s head be brought in. He sent an executioner, who went and beheaded him in the prison.

Matthew Henry Presbyterian @wholebiblehenry

Here is, I. The wild notions that the people had concerning our Lord Jesus, Mar 6:15. His own countrymen could believe nothing great concerning him, because they knew his poor kindred; but others that were not under the power of that prejudice against him, were yet willing to believe any thing rather than the truth - that he was the Son of God, and the...

Commenting on Mark 6:14-29

John Gill Reformed Baptist @doctorgill

And immediately the king sent an executioner,.... See Gill on Mat 14:10. and commanded his head to be brought; ordered him to cut off his head in prison, and bring it away forthwith in a charger to him: and he went and beheaded him in the prison; according to his orders.

Albert Barnes Presbyterian @notesbybarnes

Verse 27. (3) "executioner" or, "one of his guard"