A Kansas mother apparently seeking revenge on her ex allegedly attempted to kill the couple's three children.

Therese Roever, 37, has been arrested and charged with attempted capital murder after leading officers to believe she poisoned her nine-year-old girl, her twin brother, and seven-year-old son, in Olathe Monday around 7pm.

The sick incident took place inside Roever's home located at the 1700 block of North Lennox Street.

Authorities were called to the scene where they found the ill children who needed immediate medical attention.

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Therese Roever, 37, of Olathe, Kansas, was charged Wednesday with attempted capital murder

Roever led police to believe she poisoned her three kids (shown) on Monday evening at her home

Dad John Roever is seen smiling in a sunflower field while out on a trip with his three children in September 2016

The children, who live full-time with their engineer father, were getting ready to head back to his place before their mother allegedly poisoned them in an attempted murder scheme

The kids were on a scheduled visit with mom Roever at the time and were preparing to return to their dad, John's, where they live full-time, according to Fox 4 KC.

It seems the father had been banging on the front door for some time early Monday evening to pick the kids up. No one answered.

Neighbors were alerted of the matter when they heard the knocking at the residential complex.

That's when the mother was forced to reveal to police she had given her children something poisonous.

The sick incident took place inside Roever's home located at the 1700 block of North Lennox Street

This neighbor to Therese Roever said he had seen her 'passed out on her balcony' several times before

'Thankfully the children are recovering and should be returning home very soon," John's attorney said in a statement.

One neighbor to the mom said he saw her several times 'passed out on her balcony', according to the news station.

Court records reveal Roever and and her ex-husband John divorced back in 2016.

Roever lost custody of her three kids in 2016 for making 'false claims' about their father

However, in November, a judge granted the mom unsupervised visitation rights

Roever lost custody of her three kids at some point around the time for making 'false claims' about their father, the news stations says.

However, in November, a judge granted the mom unsupervised visitation rights - which will likely be revoked, Johnson County district attorney Steve Howe said.

Howe confirmed on Twitter the case is currently under review, while announcing in a new post Roever would appear in court for the first time Wednesday afternoon.

Howe confirmed on Twitter the case is currently under review after the charge

Howe updated the tweet today confirming the mom was charged with attempted capital murder

Roever has been booked to the Johnson County jail on $1,000,000 bond.

Her current Facebook page cover photo reads: 'STOP domestic violence' with a red hand print.

Roever posted bible verses and inspirational quotes to her page the same year of the divorce and her loss of custody to the kids.

The mom posted bible verses and inspirational quotes to her page the same year of the divorce and her loss of custody to the kids

In May 2016, she shared an Isaiah 40:29 verse that read: 'He gives power to the weak, and to those who have no might. He increases strength.'

She also posted within the same day, 'there is no fear in love, but perfect love drives out fear.'

Meanwhile, dad John Roever, a GIS Analyst II for Ervin Cable Construction, posted a photo from a sunflower field with his kids in September 2016.

'Andy, Elle, Dad, and Ben at Grinter Farms in southwestern Leavenworth County,' he wrote. 'Thanks Nana for taking the photo'