A Kiwi cop whose slick dance moves went viral and sparked an international revival of the 'running man' once abandoned his relationship with his teenage girlfriend after learning she was pregnant with his child.

Sergeant Sonny Iosefo starred in a South Auckland police running man video challenge that has been liked more than 150,000 times on Facebook and has been responded to by emergency services around the world.

But the rhythmic law enforcer has admitted that when his wife Fetaui was just a teenager she fell pregnant with their son Josh and Mr Iosefo abandoned the relationship.

Sonny Iosefo returned to his girlfriend after 8 months apart - and they have remained together to this day. Photo / NZ Police
Sonny Iosefo returned to his girlfriend after 8 months apart - and they have remained together to this day. Photo / NZ Police

"I was a coward. I was a young guy who didn't want to take responsibility for my actions. I was scared, I was too worried about myself," he told Fairfax.

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However, he returned to the relationship eight months later, joined the police force, and the couple have remained together to this day.

Their son Josh made headlines last year with a spoken word graduation speech at the 2015 Design and Creative Technologies graduation ceremony which also went viral.