Born into a small family alongside his twin bother Cian, Chris grew up learning that life can be cruel. He learned to shoplift from a young age. The shoplifting grew to pickpocketing, and eventually mugging as he got older. Living a life of relative solitude, rumours had always spread to the nearby villages of Chris' family having strange and ungodly practices such as cannibalism. Chris wasn't even sure if these rumours were to be believed, as he was not privvy to most of his parents' activities. Despite these claims, nothing was ever proven or even looked in to as townsfolk did as much as they could to avoid contact with the abnormal family.
After a violent storm flooded the surrounding areas and the nearby river broke it's banks, pouring into a graveyard and unearthing the graves of townsfolk, myth became reality as it was discovered most of the coffins were in fact empty, the family having had stolen bodies from newly dug graves. In the uproar, the family was driven from their home and sent into hiding within the wilderness of the dense forests. Exposure soon caught up and Chris' parents perished, leaving him alone with his twin brother in search of a new home.

Having found a new home, the pair settled down for a while, continuing their life of petty crime. Life was not simple to Chris, nobody was kind to him, so he was kind to nobody. Him and his brother stuck together through it all. Eventually the pair were intrigued by more violent crime, and as such they plotted a simple murder of their neighbor. He was old, and nobody would miss him. The pair snuck into his home one late night and stabbed the man to death. Getting a little carried away, and taking after his late parents, Chris decided to taste the man's blood by licking his knife. It oddly tasted quite good, so he had some more, and more again. Chris eventually decided to fully indulge in his parents' pasttime and take a bite of the man's leg. His teeth could barely piece his flesh, but after a bit of a struggle, he managed. His brother Cian tried too, and the pair ate multiple chunks of the man, before disposing his body in his own backyard.

Eventually, it was discovered that the man was missing, however there were no prime suspects, though the twins were on police's radar already. As the investigation ramped up, the fingers began to point to Chris and his brother Cian, and they began to realise it was time to get away.

Thankfully, the Virus hit and places began to go into lockdown. Cian and Chris managed to escape to mainland Europe in the pandemonium. If it wasn't for the virus which encapsulated the world, they would never have escaped the island of Ireland and began making their way to Northern-Europe to make a fresh start.

The pair began living in Norway, and with the occasional "disappearance" of a local here or there, they were never caught. Until the outbreak took a huge turn, and the dead began to rise. The pair, seeing as they were already living survivalist lives, saw this as an opportunity rather than a hinderance. They set off for Nyheim, which they heard was a safe haven for survivors, a perfect place to find new victims, and fresh meat.

Update:

That was originally the plan, but after meeting some of the people that live in Nyheim, Chris' mentality changed. He began to feel regret for what he'd done in the past. Given the state the world is in, and how nobody has ever treated Chris or his brother with any kind of respect, the way he's been treated since coming to Nyheim has completely altered how he sees people. A majority of the people he's met have been kind towards the Twins, welcoming in some cases, even. The only thing this hasn't changed, is the hunger for human flesh, it's an addiciton Chris is struggling to fight off. Since arriving in Nyheim, there hasn't been an opportune moment for him to sate the addiction, and the withdrawal is starting to get to him. Hopefully he can find someone to help with the withdrawal effects, or cure him of this addiction altogether. That, or find a fresh corpse to turn into a stew.