The brother of a Colorado mother-of-six, who was allegedly poisoned to death by her dentist husband, James Craig, has spoken out about the devastating impact her loss has had on their family and condemned Craig's alleged actions.

Mark Pray, 55, spoke exclusively to DailyMail.com as it was revealed that Craig has been slapped with new charges by prosecutors in Aurora. Last week, they filed an additional felony count of solicitation to commit tampering with physical evidence against him.

It has been just over a year since Craig, 46, was charged with first-degree murder following the death of his wife, Angela, on March 18, 2023. Prosecutors now allege that during his two-week stint in county jail following his arrest, Craig attempted to persuade one of his daughters to dispose of crucial evidence in the case against him.

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Pray expressed his gratitude to the Aurora detectives and the District Attorney's office for their "unwavering dedication for seeking justice" for his sister's "senseless murder". He said, "The heinous actions of her killer have left a void in the lives of her children, our family, her countless friends, and the world, depriving us of Angie's love and light."

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Pray described the alleged act as a "cowardly" one, driven by self-absorption, and a stark reminder of the depths of human depravity. He said, "The recent revelation of evidence tampering serves as damning proof not only of his guilt in orchestrating Angie's torment and demise but also of his utter disregard for the well-being of those around him, including his own children."

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He continued, "He manipulates and exploits anyone and anything to evade accountability for his monstrous deeds. However, his reckoning is inevitable. Whether in this life or the next, justice will prevail, and he will face the consequences of his actions."

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Pray was the one who accompanied his sister to the hospital on the morning of March 15, alarmed by the severe headaches and dizziness she was experiencing. Within two hours of her admission to University Hospital that day, she suffered a devastating seizure and began a rapid decline for which medical staff could find no cause.

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Ultimately, Angela was put on life-support, intubated, and in the Intensive Care Unit, and the family was told to prepare for the worst. She was pronounced brain dead three days later, on March 18, 2023. She was 43 years old.

In the days following her death, a deeply disturbing picture emerged of the life lived by the devoted wife of 23 years and mother who committed herself to her marriage despite doubts and despite her husband's numerous infidelities, self-confessed porn addiction, and a worrisome gambling habit that ran alongside him, "running his company into the ground."

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DailyMail.com exclusively revealed that Craig's latest mistress was orthodontist Karin Cain, 50, from Marble Falls, Texas. She flew to be by his side as his wife lay dying in the hospital but has since claimed she knew nothing of Craig's supposed plan to start a new life with her.

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Meanwhile, the 52-page probable cause document filed in Arapahoe District Court detailed the allegedly calculated and 'heinous' plot which saw Craig research and purchase poisons online then deliver then to his unsuspecting wife through potassium cyanide laced protein shakes.

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Text messages exchanged between the couple show Craig apparently feigning concern for his wife – even as she lay hospitalized, frightened, and dying – who was suffering through the symptoms of the poison he himself gave her.

While Angela deteriorated in the hospital, Craig flew his mistress from Texas, rushing from his wife's hospital bedside to her while telling Angela how much he 'wished he could stay longer.'

It is a reality shocked all those who though they knew Craig and who had bought into the carefully curated image of a picture-perfect family that he presented.

Living in an upscale development with parks, a nature reserve, and playgrounds the Craigs were a family who seemed to have it all.

But the probable cause affidavit states that, behind closed doors, Craig drugged Angela five or six years ago, in an incident he attempted to explain away by claiming he intended to commit suicide and didn't want her to stop him.

Meanwhile his wife was struggling to stay in a marriage riven by his repeated affairs, dire financial problems, and addictions.

Chelsea Norton, 35, who worked for Craig at his Summberbrook Dental Practice, where Angela also worked, told DailyMail.com, "We're all just in shock. He was a very good guy, like the least likely person for any of this.

"They were the nicest, sweetest family, with such cute kids. I've looked back on my memories to see if there's anything I missed that hinted at anything [that would explain this] at all. But there's nothing.

"He would give motivational speeches and do food for the staff some afternoons."

Yet according to the charging documents it was in this office – in a darkened exam room – that Craig researched and purchased poison online. And to this address that he had a package containing potassium cyanide delivered March 13.

An earlier delivery of arsenic was found to have been made to his home on March 4.

The later delivery raised concerns when a staff member who had not got the message to not open what Craig described as a 'personal package,' opened it and could think of no medical reason for the purchase.

She googled the chemical, labelled a biohazard, and realized how closely the symptoms of cyanide poisoning mirrored those being suffered by Angela.

It was Craig's business partner who reported the concerns to a nurse at University Hospital. The nurse in turn informed law enforcement setting in motion the investigation that led to Craig's arrest and charging.

Craig's trial is expected to take place in August.