Andrew John Semmens, 28, was last week found guilty of murdering Ravenswood man Nathan John Woolley by striking the 31-year- old in the head with a length of wood outside his Warring Street home in December last year.

Nathan Patrick Mayne, 25, and Adam Jacob Shepherd, 21, were also charged with the murder, but the jury cleared Shepherd and found Mayne guilty of the lesser charge of manslaughter.

Shepherd was found guilty of assaulting the murder victim's brother and pleaded guilty to assaulting another Warring Street resident - Michael Colin Brooks - before the murder.

All three men were yesterday sentenced in the Supreme Court in Launceston for what Chief Justice Ewan Crawford said was a violent attack on strangers who had done "absolutely nothing to encourage them".

In the course of the trio's two-week trial, the court heard the three men attacked Mr Woolley and his brother after Semmens's vehicle crashed into two wheelie bins deliberately placed in the street near Mr Woolley's home.

The victims were strangers to Semmens, Mayne and Shepherd, who had been en route to buy beer when the crash occurred.

Mayne and Shepherd were accused of holding Mr Woolley when Semmens struck the fatal blow, but the jury could not find this to be the case beyond reasonable doubt in relation to Shepherd.

Chief Justice Crawford said the trio - together with a fourth man - had gone to Ravenswood to obtain marijuana.

They first assaulted Mr Brooks, who owned one of the bins and had gone outside after hearing the crash. He was accused of deliberately putting the bin on the road and protested his innocence.

"That had no effect on them," Chief Justice Crawford said.

"Violence was their aim and pleasure, and certainly not thought or reason."

The violence continued when Semmens pulled up a second time, outside Mr Woolley's home as he and his brother walked down the driveway.