Story highlights Adam Johnson jailed for six years on child sex charges

Former England footballer found guilty on three charges

Prosecutors call offenses "calculated, considered and carefully orchestrated"

(CNN) Former England soccer star Adam Johnson has been jailed for six years after being found guilty of three child sex charges.

Prosecutors told Bradford Crown Court the 28-year-old's offenses were "calculated, considered and carefully orchestrated," according to a report by the UK's Press Association.

Prosecuting lawyer Kate Blackwell said the victim, who was 15 at the time, had suffered "severe psychological harm." In a statement the victim said she'd "entered many dark places" in the past year.

Sacked by English Premier League club Sunderland in the wake of his conviction, Johnson admitted to grooming a girl under the age of 16 and one charge of sexual activity but was found guilty of a further charge he had contested.

They related to an incident in Johnson's car on January 30, 2015, after he met up with the girl -- a Sunderland fan. Police said Johnson initially told them he was unaware of the girl's true age and claimed he only kissed her.

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