Robin was apprehended by a party of military from the fort of Inversnaid, at the foot of Gartmore, and was conveyed to Edinburgh 26th May 1753.

After a delay, which may have been protracted by the negotiations of James for delivering up Allan Breck Stewart upon promise of his brother's life, Robin Oig, on the 24th of December 1753, was brought to the bar of the High Court of Justiciary, and indicted by the name of Robert MacGregor, alias Campbell, alias Drummond, alias Robert Oig; and the evidence led against him resembled exactly that which was brought by the Crown on the former trial.

Robert's case was in some degree more favourable than his brother's;--for, though the principal in the forcible marriage, he had yet to plead that he had shown symptoms of relenting while they were carrying Jean Key off, which were silenced by the remonstrances and threats of his harder natured brother James.

A considerable space of time had also elapsed since the poor woman died, which is always a strong circumstance in favour of the accused; for there is a sort of perspective in guilt, and crimes of an old date seem less odious than those of recent occurrence.

But notwithstanding these considerations, the jury, in Robert's case, did not express any solicitude to save his life as they had done that of James.
They found him guilty of being art and part in the forcible abduction of Jean Key from her own dwelling.* * The Trials of the Sons of Rob Roy, with anecdotes of Himself and his Family, were published at Edinburgh, 1818, in 12mo.
Robin Oig was condemned to death, and executed on the 14th February 1754.
At the place of execution he behaved with great decency; and professing himself a Catholic, imputed all his misfortunes to his swerving from the true church two or three years before.