The grieving husband of a nurse who killed their three children has revealed their haunting phone call that day and the chilling reason why she strangled them.

Patrick Clancy returned home to find Lindsay with slashes on her neck and wrists and Cora, five, Dawson, three, and Callan, eight months, dead in the basement.

His wife had brutally killed them before flinging herself out of the window at their mansion in Duxbury, Massachusetts, in January 2023.

In a heartbreaking new interview Patrick talked through his steps that fateful day and opened up about how he and Lindsay - who is now paralyzed - have interacted since.

In one chilling extract he told the New Yorker he had called her from a CVS store and when she rang him back she was normal but 'seemed to be in the middle of something'.

Yet, he says, he does not blame her for the vile killings she committed. 'I wasn't married to a monster, I was married to someone who got sick,' he said.

He told how she had been suffering from anxiety and was institutionalized in the months before the brutal killings.

He also said that just a few days before her arraignment, he got a voice mail from a phone number he did not recognize - only to later find out it was Lindsay, calling from a psychologist's phone number to say she loved him.

When he called back the next day, Lindsay explained she heard a voice commanding her to kill the children and then herself because it was her 'last chance.

'She did not sound like my wife,' Clancy said of the phone call. 

It took another six months before the couple spoke again, and Lindsay told her husband how every day was the worst day of her life.

'She misses her kids,' Clancy said. 'Which I know sounds crazy to some people. But that's the reality.'

Lindsay's friends have also previously told how she often joked about having enough children to fill a 'baseball team,' and said she was 'born to be a mother.'

But Lindsay apparently started to struggle with anxiety shortly after the birth of her youngest son, Callan, who was killed when he was just eight months old.

She told Patrick she wanted to go on to Zoloft as she prepared to return to work, and started seeing a virtual therapist.

Those virtual visits, though, were more centered on medication management, Patrick said.

By mid November 2022, Lindsay lost her appetite and largely stopped socializing.

She also started having trouble sleeping, prompting doctors to prescribe more even more medication. 

Lindsay's defense attorneys have since argued that 'horrific overmedication' as a cause of her mental decline, with even prosecutors revealing in court that her blood samples found seven different medications.

Investigators found bottles of diazepam, amitriptyline and trazodone, all antidepressants, from the family home. 

All three had been prescribed to Lindsay 16 days before the traumatic incident. 

By the end of that December, Lindsay insisted she needed to go to a hospital, telling Patrick: 'I have thoughts of wanting to die, and I feel numb to them.'

At around the same time, Lindsay also confessed to having unwanted thoughts of harming her children, Patrick later told the police. 

Then, in early January, Lindsay checked herself into McLean Hospital, a psychiatric facility.

But when Patrick visited her later in the week, they saw a clearly agitated individual pacing the hallways talking to themselves, he said. 

'There were people there who were clearly, like, nuts,' he said. 'Lindsay seemed to have it together.' He added that she even texted him, 'I don't belong here.'

She was released from the hospital after just five days with a prescription for an antidepressant, and denied having any more intrusive thoughts. 

Patrick had thought she had been improving, and on the morning of January 24, she even told him she was feeling 'good' and slept 'pretty well.'

She became concerned about her daughter's stomach ache later in the day, and took the young girl to a pediatrician.

Lindsay texted Patrick at around 5pm to pick up Pedia-Lax for Cora and a takeout meal for dinner.

He did not think much of the request at the time, because he thought she was doing better, he revealed. 

But, he said, 'If I could go back in time, I'd have called McLean and said, 'Take her away, lock the door, keep her in there for a year, if you have to.''

He noted she seemed 'really good' that day. 'So what do you do? Somebody's having a great day. Should I call the hotline?' 

When he returned home, however, he found blood on the floor of the master bedroom and a bloody knife.

He found Lindsay barely conscious in the backyard, and asked her, 'What did you do?' to which she replied, 'I tried to kill myself'.

Patrick then asked where the children were, to which she replied, 'in the basement.' That is where he found Cora, Dawson and Callan, with exercise bands still around their necks.

He tried to remove them and begged each child to breathe before they were pronounced dead.

In the aftermath, Patrick said he asked his wife a few questions about what happened that day.

'I think one of the first things I asked was 'Did you plan this? Is that why you sent me out?,' he recounted. 'She said, 'No it just was like, a snap of the fingers.''

He said he asked why she looked up how long it would take him to pick up dinner, to which she replied she was concerned about him getting stuck in traffic.

'Then I said, 'Did you Google 'Ways to kill?' And she said, 'Yeah for myself, because I was suicidal for two months.''

Lindsay has pleaded not guilty to two counts of murder, three counts of strangulation and three counts of assault and battery with a dangerous weapon.

Defense attorney Kevin Reddington, who has indicated that he plans an insanity defense, painted a picture of a woman struggling with mental illness.

'This is not a situation that was planned by any means,' he said. 'This was a situation that was clearly the product of mental illness.' 

But the prosecution countered that Clancy had been evaluated by mental health professionals before and was told she did not have post-partum depression.

They claimed Lindsay had been researching ways to kill on her cellphone in the days leading up to the murders, and have suggested  her suicide attempt was staged.

A date for her trial has not yet been set.