HARTFORD, Conn. (AP) -- The family of two young boys killed in an apparent-murder suicide -- and state police -- said Thursday they want to know why the boys' grandmother, with an apparent history of mental health problems, had access to the revolver used in the shooting.
The shooting has added urgency to a legislative review of access to guns that is already under way in Connecticut, where a troubled 20-year-old man gunned down 26 people, including 20 first-graders, on the opposite side of the state at a Newtown school on Dec. 14.
The two boys' grandmother, 47-year-old Debra Denison, was supposed to take them from a day care to a birthday party Tuesday but instead drove to a nearby lake where she and the children were found shot to death after a frantic search. Police said the gun had been taken from her home, and one relative said it apparently belonged to Denison's husband.
"It was in the house, which is hard to believe," said Marcia White, a paternal great-grandmother of the boys, who said Denison's struggles with mental health were well known to the family.
State Sen. Toni Harp, a member of the General Assembly task force charged with formulating a response to the Sandy Hook Elementary School shooting, said there appeared to be striking parallels to the Newtown tragedy, including the slaying of children and gun violence by people without permits to carry weapons.
She said her working group on mental health has endorsed changing the gun-permitting process to ask about people in the household with mental illness and lay out responsibilities for owners to keep guns away from them.
"The problem is, often family members have guns in their home that are not secure, and they assume people in the home will not violate their property and use them," said Harp, a Democrat. "But we hear more and more about people taking guns that don't belong to them and doing great harm with them."
Harp said there is concern about stigmatizing people with behavioral health issues, who experts say are no more violent that others, and the legislature has to walk a fine line in taking steps to prevent future tragedies.
Several family members said Denison, the boys' maternal grandmother, had long struggled with her mental health. Robert White, the boys' great-uncle, said at a news conference Thursday that Denison had a mental disorder but appeared to have improved in recent months.
Denison had a 13-year-year-old son who wasn't with her Tuesday afternoon and was apparently unharmed. In Denison's suicide note, she said in part that God was watching over him Tuesday, White said. What exactly she meant, and her motive for the killings, is still unclear.
Denison also had a 27-year-old son, Christopher Allen, who is in prison serving a 32-year sentence for felony murder. Allen stabbed a man to death on a boat in Mystic in 2008 as he and a co-defendant boarded the vessel to steal money and drugs.
After leaving a suicide note, Denison drove alone Tuesday to the day care center in North Stonington, where she picked up 2-year-old Alton Perry and 6-month-old Ashton Perry. It was Alton's birthday.
The staff at the day care said Denison was on the list of people authorized to collect the children, and nothing seemed amiss -- the grandmother was friendly and talkative as she loaded the children in her van. The bodies of Denison and the children were found several hours later.
Robert White said the boys' parents, Jeremy and Brenda Perry, know the day care followed protocol and do not blame it for what happened.
A spokeswoman for the state police, Sgt. Donna Tadiello, said the investigation will look at who purchased the revolver, how Denison obtained it and her history of mental illness.
"Everything about that weapon, we'll try to uncover as much information as possible," Tadiello said.
Police have not released the contents of the suicide note, and White said the family does not have any clues to what triggered the violence.
"Only God knows the answer to that," she said.
A community vigil is planned Friday night in North Stonington to support the boys' parents, who are described by friends in the rural southeastern Connecticut town as friendly and hard-working. Jeremy is a landscaper, but his work has been limited because of severe injuries sustained a year ago in a four-wheeler accident.
In Connecticut, those found not guilty of a felony by reason of insanity, or involuntarily committed to a psychiatric hospital, are prohibited from possessing guns. A person also must be deemed "suitable" by police before receiving a handgun permit, though there is no standard for determining suitability, said Mike Lawlor, the state's undersecretary for criminal justice policy and planning.