An engineering student has been arrested after she allegedly shot and killed her fiance and tried to make it look like a suicide.

Meghan Werner, 22, from Fenton, Missouri, is behind bars after Curt Marzolf, also 22, was found gunned down in their home in Rolla a week before he was set to graduate.

When cops arrived at their property on Saturday, Werner initially told them he had taken his own life.

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Meghan Werner, 22, (left) from Fenton, Missouri, is behind bars after Curt Marzolf, also 22, (right) was found gunned down in their home in Rolla a week before he was set to graduate

But, according to KTVI, officers found items inside had been broken and thrown about - suggesting there was a disturbance before the fatal blow.

Werner was eventually booked on murder charges.

The couple were both studying engineering at the Missouri University of Science and Technology.

They were also members of a local skeet and trap team. Police said they kept guns in the house.

The Rolla Police Chief Sean Fagan told the TV station it was a domestic dispute that turned deadly.

He said: 'It’s a shame. He already had himself a full-time job as an engineer in Kansas City. It’s a tragic situation, the whole thing.

'Both families are very upset. This is tragic for both families. Neither of these young people, they’re both 22-years-old, neither of them have ever been in any trouble and now their families are having to deal with [this] especially during the holiday season.

Meghan Werner is being held in the Phelps County Jail on a $1million bond

Werner (pictured in her mugshot) is being held here in the Phelps County Jail on a $1million bond. When cops arrived she initially told them her fiance had taken his own life, but she was later arrested for murder