McClenaghan, 49, of Broad Street, Magherafelt, used an antique double-barrelled gun to shoot the mother-of-four dead in the Portstewart launderette where she worked in March 2011.
When police searched Mr. Lanza's home, they found a gun locker belonging to his mother unlocked with no indication that it had been forced open.
The gunman, Adam Lanza, also gunned down six adults after killing his mother, an avid gun collector, in her Newtown home.
She was named in a grand jury indictment, released Wednesday, accusing her of helping her mother get rid of the gun authorities say was used to kill the child.
Although the 50-49 vote was on a nonbinding "sense of the Senate, " which seldom take up this much of the Senate's time or attention, this one was passionately fought against the backdrop of the huge Mother's Day march for gun control.
The killing led the victim's mother to embark on a campaign for gun restrictions.
The shooter's mother, Nancy Lanza, bought the Bushmaster firearm two years ago at Riverview Gun Sales, according to Detective Matthew Carl of the East Windsor Police Department.
What the Mother Jones study omits by design are all examples in which a civilian with a gun stopped a shooting spree before four people were killed.
Mr al-Hilli's dentist wife Iqbal, 47, her mother, Suhaila Al-Allaf, 74, and passing cyclist Sylvain Mollier were killed in the gun attack.
BBC: Alps al-Hilli family murders: Man charged in fraud inquiry
He does not want to see any more gun tragedies and was appalled that the gunman, Adam Lanza, had managed to get his hands on his mother's powerful assault rifle.
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