Kallenbach (64) was married to the Irish crime godfather in 2001 and the pair lived together in the UK as well as Amsterdam.
But after splitting from Kinahan in 2007, she found new love in the arms of a notorious serial killer who had murdered a woman and her two kids.
Kallenbach ran a number of businesses including beauty salons, car dealerships, and construction firms with the Dapper Don from the home they shared in Surrey before they went their separate ways.
She stayed in touch with the Kinahan family after the relationship ended and even wished Christy’s son Daniel a Happy Christmas on Twitter
She later struck up a relationship with married triple-killer Louis Hagemann, a former Hells Angel who was serving life in prison for the 1984 killings of his ex-girlfriend and her two children.
He also faced the courts in relation to another death, that of Irish woman Joanne Wilson in 1985 but was acquitted due to lack of evidence.
Ms Wilson from Ormonde Street, Portadown, was just 22 when she disappeared without a trace after meeting a Dutch man later identified by her friends as convicted sex offender Hagemann (60).
The prosecution alleged that Hagemann took the young hotel worker to his Amsterdam apartment where he stabbed her to death before cutting up her body.
Some weeks after her disappearance, a female torso and left leg were discovered wrapped in plastic bags floating in a canal in the Dutch capital close to Mr Hagemanns mother’s houseboat.
Ms Wilson’s head and other limbs were never found.
Eventually, the torso and leg were linked with Ms Wilson through body hair found in her flat and the imprint of a sandal.
Young Dutch mother Corina Bolhaar and her children Sharon and Donna were slaughtered by Hagemann in 1984.
Hagemann who was known to Dutch police for helping to control the movement of drugs through the country stabbed them to death in their Amsterdam home.
Corina’s other son Brian then just one-year-old was spared on the night and was found in a cot in the room next to the bodies of his mother and siblings.
A neighbour made the discovery two days after the murder when she heard the baby crying from inside their apartment.
Hagemann has also served nine years for bank robbery, as well as time for aggravated assault, fleeing from prison and arms and drug offences.
He was also handed a six-year prison sentence in 1998 for the rape of his girlfriend, Renetta van der Meer.
But Kallenbach launched a high-profile campaign to see her husband cleared of the killings and she swore his innocence.
In an interview with a local Dutch paper Ms Kallenbach insisted Hagemann was an innocent man.
“In 2005 my husband was sentenced to life imprisonment for the horrific murder of Corina Bolhaar and her two children. Completely wrong! Louis doesn’t have a clean past, but he has no murder to his name,” she said.
“Many may wonder why I am married to someone who has been given a life sentence. Louis has always had a place in my heart. He is familiar, we don’t have to explain anything to each other, we can appreciate each other, loved and love each other.”
Her former husband, Christy, meanwhile, has managed to consistently stay ahead of his rivals in the drugs trafficking “game” over the course of his criminal career.
However, the Kinahan Organised Crime Group (KOCG) is now under huge pressure after leading members were sanctioned by the US government.
After their assets were frozen in Dubai, the leaders of the KOCG are said to be desperately trying to move their assets out of the Gulf State.
UAE officials recently froze all assets belonging to the key members of the Kinahan Cartel following a wave of negative publicity after they were sanctioned by the US government.
The Sunday World previously revealed how Christy Snr had been moonlighting as an aviation broker and running social media accounts as he manages the cartel's finances in the Gulf.
But a tsunami of business shocks have hit Kinahan in recent weeks, after his sons and their money launderers were hit by US sanctions.
The secret world of the 'Dapper Don' was revealed for the first time by Sunday World after we discovered his online network and linked phone numbers and addresses to a string of his companies.
Despite distancing himself from the day-to-day operation of the Kinahan Cartel's drug-trafficking operation, Christy Snr has continued to mastermind the mob's financial operations.
He remains heavily involved in money-laundering for the gang, investing their cash in legitimate and shell businesses across the Middle East.
The US Department of the Treasury has formally sanctioned Christy Snr, who they describe as playing a key role in the KOCG.
"Demonstrative of a long history of criminality, Christopher Sr. has served prison sentences in Ireland, the Netherlands, and Belgium, including: six years for dealing heroin, two-and-a-half years for possession of cocaine, and four years for money laundering.
"During this time he was building a list of contacts that grew to what became known as the KOCG. Christopher Snr's sons, Daniel Kinahan and Christopher Jnr, now manage his drug trafficking operations while Christopher Snr oversees the property portions of the enterprise."