He received a sentence and probation, with Spears now representing him. A month later, in January 2007, he was found guilty of third-degree assault after the cigarette incident with Williams, and he went to jail for the 90 days that Horan originally had negotiated.
Released in April, he resumed his tumultuous relationship with Williams, over the objections of her mother.
Three days before his October arrest, Chapdelaine was ordered into a domestic violence program for repeat offenders. The class, described as a program with a "good track record for changing behavior," had been recommended by his probation officer, who counseled him twice a month.
Asked why Chapdelaine's latest arrest did not immediately trigger a violation of his probation, state officials say Chapdelaine's probation officer was awaiting paperwork from the Newington Police Department. Newington police say they never received a request for the arrest report.
Gary Roberge, the assistant director of Adult Services who supervises the state's probation officers, said that Chapdelaine's probation officer "acted appropriately" in handling Chapdelaine's case. "He used his own judgment that he would seek a violation. He was in the process of preparing the warrant.
It was not submitted to the court. He was waiting for the police report."
The spokeswoman for the Newington Police Department said that, had the probation officer contacted the department, he would have been faxed a copy.
No one knows what set Chapdelaine off the night of Nov. 5.
But the path he took into his neighbor's home was still evident a week later, even as Coley's husband and daughters prepared for her funeral.
There were shards of glass, bullet holes and puddles of blood lying beneath plywood and plastic bags in the living and dining rooms.
When Lorna Coley returned home from her job as a nurse's aide about 8:30 p.m., she saw Chapdelaine standing outside her home, pointing a gun at her daughter's bedroom window. She called police. For the next few hours, Hartford police say, they were unable to find Chapdelaine. Coley and Williams could not be persuaded to go to a shelter.
The police left. About midnight, Chapdelaine returned. He climbed the dozen or so stairs onto the second-floor deck, before firing the rusty .357 revolver into the sliding glass door of the two-family Cape.
He aimed the gun at Williams and it misfired, police said.
Then he fired again, shooting Coley, who was near a chaise lounge in the living room, in the head.
Leaving the home on foot, Chapdelaine crossed into Wethersfield, where a convenience store clerk on the Silas Deane Highway saw blood on his hands and face and called police.
Confronted by police near the Food Bag grocery - where he had been arrested in 2005 after picking up his daughter for an outing - Chapdelaine walked back and forth across the roadway. "It was strange," said Police Chief James Cetran, who knew Chapdelaine from the days when he washed police cars at the Mr. Auto Wash.Chapdelaine fired the gun twice, striking no one, police said. Two SWAT team officers fired back. Chapdelaine died a short time later.
"Something in him must have snapped," Carl said. "He always called me when things weren't going right. I want answers. Can't someone sit me down and tell me what happened? I don't even blame the police department. They did what they had to do. I'm sorry [Williams] lost her mother. It's painful for all of us."
Coley's husband, Donald Brown, said in a brief interview the day before his wife's funeral that she did not want Chapdelaine to continue seeing her daughter. She didn't "deserve to be killed," he said.