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Having already set his sights on framing Anna Windass (Debbie Rush) for the attempted murder of Seb Franklin (Harry Visinoni), Pat blackmailed Andy by telling him he could can have his freedom back if he killed Vinny.
Pat had convinced Andy that he would let him go if he helped him to take Vinny hostage as his "replacement".
With freedom in mind, Andy co-operated, but he was unaware that Pat had a dark twist set in store for him.
Phelan sought revenge on Vinny after he made off with all the money from the duo's plans to scam Weatherfield's residents by selling flats they had no intention of building.
The chilling episode saw Vinny battered and bruised and covered in blood, as he lay gagged and tied up, before Pat yelled at Andy until the terrified hostage shot Vinny.
Then, when Andy considered shooting Pat in revenge after being locked up for months, brainwashed and tortured by the cobbles' resident villain, Pat lost his temper and shot Andy dead in turn.