A Prague court acquitted Tuesday the frontman of US heavy metal group Lamb of God, Randy Blythe, of charges of involuntary manslaughter over the death of a Czech fan in 2010.

Blythe, 42, went on trial on February 4 after pushing a 19-year-old fan off the stage on to a concrete floor during a concert at a Prague club in May 2010.

The fan, who had reportedly tried to climb on to the stage several times, died of head injuries two weeks later.

Judge Tomas Kubovec said Tuesday the fan had tried to get onstage because he had misunderstood Blythe's call for greater applause which would have been "absolutely understandable for English speakers," the DNES broadsheet daily said on its website.

Blythe, who pleaded not guilty and attended all the hearings in the trial, admitted to having pushed the young man off the stage but insisted he saw him stand up again in the crowd.

He apologised to the dead fan's family, who had demanded damages worth 10 million koruna (389,000 euros, $527,000).

Czech police first detained Blythe upon his arrival at Prague airport in June 2012.

He was freed without charge in August but had to post 237,000 euros bail. He left the country after committing to return for the trial.