Relatives of two of the four young men who were murdered by Cosmo DiNardo one year ago stood with lawmakers Tuesday to push for stricter gun laws, measures lawmakers say could have prevented their sons' brutal slayings.

DiNardo, who had been involuntarily committed for treatment of schizophrenia, used his mother's .357-caliber Smith & Wesson handgun in the killings, according to authorities and court documents. Through an attorney, the DiNardo family declined comment Tuesday.

Sharon and Rich Patrick, the grandparents who raised Jimi Patrick, and Melissa Fratanduono-Meo, mother of Tom Meo, stood behind the officials as they spoke but did not comment.

"Few of us can comprehend the horror these families experienced, and it is my fervent prayer that none of us ever has to," Tai said. "But yet it is a grim episode that we as a state and nation have watched happen too many times. A person who never should have been able to access a firearm somehow does so with horrifying and heartbreaking results."

The package of legislation remains in its nascent stages. Tai said she would begin seeking cosponsors after Tuesday's news conference. Historically, gun-control measures have failed to find bipartisan support in the Pennsylvania legislature.

If these were to defy the odds and pass, the laws would also require that weapons be secured when not under "direct control of the owner," Tai said, and mandate that gun owners report the loss or theft of a gun within 24 hours of discovering it missing. Criminal penalties could result if gun owners fail to do so, Tai said.

Warren said that he would be reintroducing a universal background-check bill, similar to one that died in the House Judiciary Committee in June on a 14-13 vote. A March Franklin & Marshall poll indicated that 86 percent of Pennsylvanians support tougher background checks.

Tai, who was a Solebury Township supervisor when the murders occurred, said a recent Mom's Demand Action panel of local gun owners and non-gun owners found "common ground" on two issues: universal background checks and safe storage.

Massachusetts has the strictest laws regarding storage, requiring all firearms be stored with a lock. New York, Connecticut, and California require guns be stored with a lock if the owner lives with someone is prohibited from accessing them, according to the Giffords Law Center to Prevent Gun Violence.

"I cannot imagine the anguish these families have felt," Tai said, "but if we can prevent one more death from gun violence, if we can prevent one more family from suffering the loss of a loved one, then perhaps we as a society will have begun to properly honor their sons' memories."

Last July, DiNardo, 21, of Bensalem, lured four young men — Patrick, Meo, Mark Sturgis, and Dean Finocchiaro — to his family's Solebury Township farm. In DiNardo's confession, he told investigators that his victims thought they were there to buy marijuana. Instead, he fatally shot and buried them.

He and his cousin Sean Kratz, also 21, were charged in the murders. DiNardo pleaded guilty in May and is serving four consecutive life terms. Kratz, his alleged coconspirator, balked at his chance at a plea deal. His trial is expected to begin next year.

All four victims' families have filed wrongful-death suits, contending that DiNardo; Kratz; DiNardo's parents, Sandra and Antonio; and their family companies share blame in the killings.