Who killed the West End Gang's top safecracker?

Earl Poirier and Diane Frechette

7929 Birnam

These days the cute duplex at 7929 Birnam in Park Ex is the property of Datta Ratan Kumar, but long before he purchased and remodeled it, the home was the site of a little-discussed and shockingly brutal murder involving a member of the usually-not-barbaric West End Gang.     On the night of Tuesday March 13, 1984, Earl Poirier, 49 and his girlfriend Diane Frecehette, 35, were bludgeoned to death as they slept by two assailants wielding sledgehammers.
   Their dog had apparently not even barked so it's quite likely that the attackers were well-acquainted with the couple.
    Poirier had been an accomplished safecracker for West End Gang member Billy McAllister's crew since the 1960s.
    The gang had been nabbed setting up a robbery in Rock Forest near Sherbrooke. So it's possible that the others in the gang rubbed him out either because they suspected him of ratting or of being a risk to testify against them.
    Killers don't usually also murder their target's spouse, so it's not known why they went after Frechette, who worked in a tavern at Stuart and Jarry, just around the corner from their home.
    Frechette also worked at the tavern - now called the Loutraki -  where Stuart would hang around all day and lend out money as a loan shark.