HARRISBURG POLICE•GETTY Artur Samarin, 23, claimed he was 18-year-old Asher Potts

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Police believe Artur Samarin, 23, may have also been planning a mass shooting after talking about making his name the "biggest in the world". Samarin's work and tourist visa expired in 2013 but he started impersonating a high-school student.

FOX 43 Samarin arrives at court charged with fraud, sexual assault and theft

The fact that he's 23 years of age, he looks young, that made it easier to pull this off District Attorney Francis Chardo

Police say he used his fake name to obtain a driving licence and social security card after he was threatened with deportation to Ukraine. He assimilated into the John Harris high school in Harrisburg, Pennsylvania, and was even accepted into a university in Florida.

GOOGLE MAPS Samarin was a pupil at Harrisburg high school, which he nearly graduated from

He pleaded guilty to statutory sexual assault after admitting to sleeping with a 15-year-old and also admitted to theft. The impostor was staying with couple Stephayne and Michael Potts, who said he started to talk about a possible attack on the 1,650-pupil school. Mrs Potts said: "He made comments about other shootings, and he told us that everybody was going to know his name.

"He said his name was going to be the biggest in this world." But Samarin denies planning a horror attack. Dauphin County First Assistant District Attorney Francis Chardo said it was a "unusual" case.

The deadliest mass shootings in US history Sun, June 12, 2016 Columbine High School in Colorado, Sandy Hook Elementary School in Connecticut and now 50 young lives lost in an Orlando nightclub. What will it take for the USA to reform their gun laws? Play slideshow EPA 1 of 12 20 killed in a shooting inside Pulse nighclub in Orlando, Florida